I was surprised at how clever this old jeep Part is

It's more clever than you might think!
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[@tom7601]

All of our tractors on the ranch had oil bath air filters. There were days when we had 3-4mm of dirt in the bottom of the bowl.

[@brentwalters8921]

Back in the day when Mt St Helens blew her top off, many area service and emergency vehicles were retro-fitted with oil bath air filters.

[@Houndini]

Correct.

[@Name-ps9fx]

Yup I remember Stste Patrol cars having a big ol' Kenworth air cleaner mounted to the front push bar!

[@kimmer6]

I was in Taiwan in 1980 and my buddy's parents lived in Yakima. The China Post said that the state of Washington ''blew off the face of the Earth''. It took us 2 days to find out that Yakima was OK and his parents were fine. But their truck quit after the air cleaner plugged up with ash.

[@solomonlynn7456]

You can't get the oil bath base out without spilling it because it was never designed that way. They used to just flip the oil on the ground under the Jeep.

[@ddjohnson9717]

how do you refill it then?

[@solomonlynn7456]

@@ddjohnson9717 you pour some more in and latch it back on. It's not like you can't see or reach it, you just can't remove it without spilling it on the ground. That seems to be frowned upon these days...

[@ddjohnson9717]

@@solomonlynn7456 Oh yeah. I just realized that you can level the tray in place and then add the oil... lol was wondering how it works when you gotta add the oil first then wiggle the tray back in but soon realized thats not how it works

[@Houndini]

Good system until tree huggers & Ca people that ran themselves out of there own home state over. Do It Right Now! And prices skyrockected there to the point they cant afford live in there own home state no more. I see engines that designed that way made late 50's early 60's. We can do better but not overnight. I love when I seen Woman WV State Police pick up a big loud mouth male protester & body slamed them on ground over slapping her in her face. Wrong Mistake. He did not move for over 5 mins. KO him. They didnt screw around with police after that 1 & did not come back. She told him you come back she will hurt him very badly. Very funny to watch.

[@dvig3261]

@@solomonlynn7456 during a combat situation that drowning would turn to looking the other way..methinks. lol

[@storetapir]

Great video again, thank you. Just a tip - take the hole air cleaner off, when servicing it. No risk of dropping the hole cup of oil into your engine compartment. Daily checks can be done by just undoing the two snap locks and lowering the cup a few centimeters for inspection. Everything as described in TM9-803 chapter 73.

[@MoreFormosa]

A lot of early VWs also used oil bath air-cleaners with horse hair as the fiber matrix

[@Colorado_Native]

My 1955 Ford Thunderbird has an oil-bath air filter. Ford went with a paper element on thoe in 1956.

[@jamesclark3119]

My old Mercedes 190d had a oil bath air filter and a warning not to over fill it or the engine could runaway. Wouldn't happen with gas engines. Most agricultural engines had oil bath and some had a centrifugal separator pre-filter with a Mason jar to collect the rubble.

[@MoreFormosa]

@@jamesclark3119 that's right, a lot of tractors has these too, good point. And with centrifugal separators? wow! didn't know that, the Dyson of air cleaners 😂

[@veewee111]

Not horse hair. Tis Coconut coir.

[@paulmanson253]

My 1977 Ford 1 ton truck had a factory heavy duty air cleaner,and sure enough it was an oil bath unit. Had a factory intermittent wiper,unusual for that year make and model. Do a full LOF once a month,grease the front end twice a month,change the air cleaner oil once a month,remove and clean meticulously every second month. Enough of a pain and somewhat messy. That truck never broke without warning me first. Back when Ford built a simple,strong vehicle. Best investment I ever made was the factory shop manual series.

[@benjohnson1082]

The oil bath is the way to go. Its still quite easy to buy non detergent motor oil for it as well. Great video!

[@Greendot319]

Cheers Ben

[@philliplopez8745]

That filter also acts as the " top end lubricator " it lubricates the valve stems insuring long guide life .

[@timengineman2nd714]

We often used a large suction "syringe" to get the most of the oil out prior to having to tilt the thing off of the Diesel engine.... (made "more fun" by the ship's pitching and rolling!)

[@mcy1122]

Marvelous content from an expert of the mechanical aspects -but also historical context- of the WWII Jeep (one of a handful of vehicles that’ can claim significance in history, and culture - like the VW Beetle and Model T). What makes it entertaining is the creator’s obvious respect for and love of his subject. Thank you 🙏🏽

[@ianbedwell4871]

I owned a Massey 28hp tractor from the mid 30s, the oil bath filter was standard. And having worked in the Canada logging industry loads of other vehicles had them as well.

[@tedsmith6137]

If you look at the photo of the Jeep being painted, the Antenna mount is in a completely different position from yours. It is forward of the rear axle.

[@ryangrimm9305]

Oil bath air filters were common on many, if not most, American cars well into the 1950s. My grandmother's 1953 Ford F-series truck had an oil-bath air filter, with lines stamped into it to make the correct oil level, and a sticker telling how often to change the oil, how to clean it and what weight oil to use depending on summer or winter temperatures. A 1954 Plymouth BELVEDERE Coupe a friend has (and he drives it almost every day) still has an oil bath filter, as did my 1953 Ford Fordor...my first car BTW, got it in 1971 for $50. I also remember most small engines for such as mowers also had oil bath cleaners, but car companies realized they can sell you a LOT of paper filters. KA-CHING! Irony here Is I convert all my vehicles to K&N oil gauze air filters, they are cleanable and re-oilable. They come with a million-mile guarantee, and are more efficient after 10,000 miles that a new paper filter, if I remember the paperwork correctly. I clean mine once a year (probably overkill), that's about every 20K miles. NO, this is not an ad, I've been using them since I found one on a motorcycle I bought about 24 years ago..and still have that bike. Took it from 32K miles to 153K miles.

[@alward9901]

The VW Beetle used the oil bath filters very efficient .

[@paulmartinez8337]

The beauty of owning a Jeep. Whether it's a 1940s MB or Willy's.

[@samholdsworth3957]

🤷🏼‍♂️

[@kimmer6]

I got a 1944 Ford GPW radio Jeep in in about 1968. Looks like his with those compartments in the fenders. The frame has a heavy plate under the rear floor with 4 holes in it to hold a 50 caliber M2 machine gun mount.

[@chefchaudard3580]

That's why antenna base was in the rear, in a less exposed position, on French Hotchkiss Jeeps made after the war... Thanks!

[@ronhatch6853]

Good job! Just because the technology is old doesn’t mean it isn’t good. We need to remember that these vehicles were just a tool in hands of soldiers just trying to get the job done. No 2 Jeeps were the same after serving on the frontline. Great job, keep em coming.

[@nimrodquimbus912]

everything from that era is ingenious.

[@andymckane7271]

The series Land Rovers (except perhaps for the Series III fitted with V8) all had oil bath air cleaners as standard equipment. They were excellent and extremely efficient.

[@201Jeep]

always learn something new from this channel. Stuff that's not in any manual I have, or in the club magazine!

[@robbierob20062005]

Very informative video. Getting my Willys in 2 weeks so I'll check your channel is you have more of this type of vids .😀 Thanks for sharing👍

[@dmcarpenter2470]

As always, entertaining and informative. These "Oh Dear" vids have a quality all their own.

[@robertgordon6263]

photo of the MP 50 The photo shows the MP 50 mounted just behind the drivers left shoulder , it is not mounted in the same Location

[@imgettinby]

That's the first thing I noticed too, it's over the forward part of the wheel opening in the picture

[@dukecraig2402]

Almost all US made vehicles had oil bath air filters back when the Jeep was designed, it wasn't just a military or industrial thing, they all had them. Paper air filters really didn't come into common usage until after WW2. One thing about paper filters whether it's air or oil, the dirtier they get the better they filter, the problem is when they get so dirty that they restrict flow, especially with a lot of modern oil filters that have a bypass in them, your oil pressure will be normal but you'll be circulating unfiltered oil through your engine.

[@Iowa599]

My 1948 Massey Harris 50 (tractor) also uses an oil bath air filter, I use a vacuum brake bleeder to suck up most of the oil before removing (and cleaning) "filter".

[@johndoe43]

Friend of my dad ran a radio jeep in ww2. They did a book on his unit and had a photo of him in the Jeep in a bombed out city much like the photo you showed. Drawing a blank on where it was at. Old age. It will come to me later. He along with my dad have passed. In the photo they didn't have the top up.

[@ryangrimm9305]

Oh, regarding the 'extra' hole for your brush guard...IF YOU DRINK, DON'T DRILL.

[@veewee111]

Other reason the oil bath air cleaner is a must for carb fitted engines is that due to the self cleaning by oil spray of the upper filter (most likely packed with coconut coir) means the air restriction to the engine will not change as long as one keeps up on when to clean out the dirt out of the oil in the very bottom of the air cleaner. With paper filters as soon as you run the engine it is clogging up with even the very finest dust with every mile. This slowly but surely causes the air to get harder and harder to suck into the engine. Which in turn with a carb results in more and more fuel getting sucked into the engine so it runs more and more richer. Which can result in so much fuel getting into the cylinders that is washes off the oil and ruins the pistons and cylinders due to lack of lubrication. With electronic fuel injection the air sensor in the exhaust tells the computer to cut down on how much fuel the injectors spray, so it does not get too rich of fuel mixture.

[@whosonfirst1309]

That photo you show is different. The antenna mount is forward of the rear tire.

[@808bigisland]

Cyclone filters work. In a sandstorm in the Sahara I filled the dish in 1h and kept the secondary paperfilter spotless. Its NOT for topend lubrication..its to keep your paperelement from failing and dust killing bearing surfaces and seals in your engine. Industrialquality paperelements are not cheap either..not your orange fram.

[@jeepersdelight]

Jason from Maryland here. Dear Jeep friend, Connect with the US, 'PA Jeeps'. I've attended the annual show straight since the beginning, However, There are a good few WWI MB units at the show that could help. Edit, If you attend, me and by brother will spot your camping accommodations.

[@paulferrara9079]

Find the same thing working on WWII aircraft. restoration, and building replicas. kinda fun, we have one of those jeeps in our hangar. yes we do tow a plane now and then with it.

[@blacksquirrel4008]

Very good description of the oil bath’s action, many people get it wrong. Unfortunately, I had to remove the screen on mine because it had laid open for years in a shed and mud dauber wasps had loaded the top of it with pounds of clayey mud. There was no way to clean that sufficiently to protect the engine.

[@zombrero7870]

My dad would have loved this channel

[@MikeBaxterABC]

How much room do the top bows need to sneak out? Could you add a spacers to the spare tire mount ... move it out a little bit?

[@martentrudeau6948]

Nice little Jeep, but with some inherent and interesting design quirks. -- And it's history has British roots, in 1930 Austin of England founded the American Austin Car Company, which eventually was renamed the American Bantam Car Company. This company provided the basic design for the jeep, truly a great vehicle.

[@sinkinpat]

I had the same problem. My solution was a wing-nut on the brush guard to body. And leave the bolt slightly loose on the MP-50 to brush h-guard. When I want my top bows up, I take the wing-nut off. Remove the bolt, rotate the brush-guard and pull them out. Reverse process. To rotate and attach brushguard to body. It is a lot easier than removing the spare every time I want the top up or down. Nobody any wiser.

[@Greendot319]

Thats a good idea!

[@kenbrown2808]

I'm a bit late to the conversation, but have you looked at putting in a spacer to position the spare tire just a wee bit further away from the body to give more clearance?

[@sinkinpat]

@@kenbrown2808 , that could work. I have the spacers from the cross country kit. Which would be period correct. I will try it and see if it works.

[@kenbrown2808]

@@sinkinpat good luck. it would be nice if it did.

[@nieuportflyer]

Great one! Very informative. Thanks for sharing that.

[@Greendot319]

you're welcome

[@tananam9782]

Maybe mentioned elsewhere in the comments: There is more than one type of oil-bath filter. This one is much different than other American automotive filters from the 30's through the 50's, and different than my old Yamaha Tri-Moto 125 two-stroke three-wheeled ATV (man, I wish I still had that thing). Most Oil-bath filters I'm familiar with use capillary action to wick oil into a thin filter membrane, where the oil in the filter element captures the dust particles. This requires frequent cleaning with solvent and the re-application of oil. It's also very restrictive: Air doesn't move through a mesh with oil in it very easily. The advantage is that it's a reusable system, no need to get a new paper filter, just wash the old one. Perhaps your system might be better described as an "oil sump filter." The filter isn't in a "bath" at all. I think as you described, it's a rather cleaver system. I'm not sure how effective the filter material above the oil sump is, perhaps it makes contact with the oil, and therefore also works as a "bath..." but you didn't describe that bit. Turning the air back and fourth through the filter is inefficient, but it's already a Flat-Head, so it's already inefficient. I doubt much is lost in induction. With an OHV engine, that might change.

[@markjames9205]

My 1974 VW Thing had the same type of oil bath , worked great!

[@lewismocaby3646]

Great video,looking forward to seeing more. Not all Jeep’s are built the same. Great grandpa started his automotive repair business here in Southern Illinois in the 20’s,I’ve heard stories about the WW-II Willys Jeeps since I was little from his son my grandfather. The WW-II era Jeep’s were built by several different auto makers under contract. Grandpa waited 6 weeks for transmission parts for one of those Jeep’s that had a mostly Jeep drivetrain but the transmission case itself was filled with a mix of Dodge and Jeep gears and shafts. He also talked about some of the wartime stuff being mixed with Ford and Studebaker parts. I myself worked on a federal construction job and learned firsthand that the US government giving contracts or projects to the lowest bidder isn’t the brightest idea. Anyway,keep up the great work and I’m sure glad to see other people interested in the history that got us to the technological point we’re at today.

[@kimmer6]

Ford also built Jeeps. These were designated GPW. I still have one in my mom's garage.

[@vr4787]

I guess a modern day equivalent would be an air oil separator . An alternative to the paper filter would be a dry synthetic filter that doesn’t need oil and is reusable. You just give it a wash or bang it a bit to get the dust off in a pinch.

[@mliittsc63]

This has to have been mentioned in other comments, but in the photo of the woman painting the star stencil, the antenna mount is forward of the wheel well, which means that the top-bow(?) won't hit the brush-guard...

[@timblack6422]

Beautiful points, Cheers!

[@jcm4377]

Best way to renew oil from air filter is removing clamp that connects filter to metal duct to carburettor, unscrew four wing screws that fix filter body against firewall and simply remove it in order to proceed to oil replacement. Five minutes is more than enough for this unless you also decide to wash with gasoline the metallic core that is inside ( you should do that once in a while). That’s the way I do with my Willys MB from 42! 😎

[@kyleb209]

Great info, I har no idea about the oil bath air filter. Thank you for making the video. 👍

[@Name-ps9fx]

That is such a cute little car!

[@craigcorson3036]

I would really enjoy hearing what that horn sounds like.

[@Greendot319]

kzbin.info/www/bejne/gmObqHqpo8qXf8k

[@powerbomb400]

It's not a Jeep answer. But look at the Ford 2n,8n and 9n tractor's they used the same system. It's a great system as you said for dusty condition's. At that time yes when it got time to clean you would just dump it somewhere close. If there was a wartime motor pool they just dump it on the ground. Most likely in a hole they dug and when they moved on cover it and head out. I have a 1949 Ford 8n tractor and the drain hole for the oil pan is 2 1/2 inch hole. Even catching it in a pan is hard.

[@tracylemme1375]

My dad’s 1938 McCormick tractor had a “cyclone”separator before the oilbath air filter. It would collect about a pint of dust in one half day. Imagine that going through your engine, or clogging a paper filter.

[@dalemettee1147]

As you were showing the bush guard on the antenna mounting bracket and the clearance problem with the top bow, a thought came to me. a wing nut as with other locations would have given the operator the option to remove the mounting place for the guard to assemble the cover bow.

[@TheKRU251]

Oil Barf? Sick? Oil Bath more like : ) Keep the vids coming. Love the enthusiasm!!!!

[@dvig3261]

I think I might design the bowl either with a rounded bottom or a funnel shape with a drain valve and tube. Then with a filler tube on the front side..drain it, remove the empty bowl to flush sand clean, reinstall the bowl and fill to the proper level.

[@donstewart2059]

i saw a book of all the parts they put in them and all the parts were the best quality eg dina diffs etc

[@gravesclayton3604]

My 1962 Renault Dauphine has a factory oil-bath air filter. Also, being that the motor is at the rear, the air to the engine air filter is fed in from a pipe thea runs from the front boot of the car, where there is minimal road dust being kicked up. Maybe a bit extensive for road use in 1962, but very effective nonetheless.

[@jkxelor1295]

I love your jeeps and I enjoy your videos OK

[@chickenfishhybrid44]

Could use a fluid evacuator. Hold it in the position you had it and use it to suck the oil out. I have a mity vac brand one, for people who spend a fair amount of time working on vehicles it's damn handy.

[@clhuke6494]

My father changed out every truck he had for "oil bath" air filters back in the day, up until the 1990's, he definitely believed in them.......

[@doncarlton4858]

My Jeep's antenna mount didn't have a brush guard and I never knew about it so I had little trouble putting my top up.

[@mr.bonesbbq3288]

Enoyed yer Wills MB vidyas, Mate! Da was a WWII Vet, an learned me to drive on a '46 CJ-2A

[@lattitude01]

If you arn't too worried about being 100% authentic, you could get a block of wood shaved to like a 27degree angle or so paint it black, and drill the bolt holes out of it and position it between the factory spare mount and the spare so your spare would sit at a slight incline and buy you those extra few inches you'd need to properly deploy the canopy

[@bruceklassen8261]

Your Jeep is finished to such a high level…… mine shall we say has some real rough edges

[@markweber2958]

The radio mount in the pix is forward from where yours is

[@lukebaker1167]

Oil baths work real well!!!

[@petethebastard]

Great vid, Nice Jeep! I have two points... 1:You worked on Factory Drawings... I imagine they'd be laughed at, at the User end of things. [Hence the bent bows and differently mounted antennae...] 2:soldiers don't mind getting a bit of oil on anything.... Good vid, well done.

[@adam8888d]

Maybe the reason why the air filter was mounted with wing screws is so that it can be removed before removing the bottom.

[@1945gmc353]

But if you look at the picture the mount is further forward than yours as she's faking painting the star

[@joemccabe5270]

I agree with that totally. I think the bracket should actually be forward of the top of the wheel arch. Personally, the best option is to position it just left of the jerry can bracket on the back panel. Remove one of the footman loops and put it instead on the top of the bracket. Works a treat. It might not be wartime correct but its tidy and your jeep will still fit up the narrowest alleyway. Whose to say what correct in a wartime field modification.

[@grandpaogre3724]

Did anyone else notice that the old picture he referenced show the antenna mount on the forward side of the rear fender?

[@MrJeep75]

Love the videos

[@anthonyburke5656]

Yes, the Studebaker truck circa WW2 was a piece of good engineering, you only needed 3 spinners/wrench’s to take it apart completely

[@allenwatkins4972]

No. spanner, not spinner, not wrench's it's wrenches.

[@mynameisgladiator1933]

Actually, why not put a fly nut on the brush guard on the under side of the brush guard where it meets the Jeep body? (and maybe another one on the other end so it can be loosened quickly) Then when you want to put the top up, instead of having to remove the spare tire (bummer), you just undo the flynut (or whatever they're called), twist the brush guard out of the way, put the top up, and reattach the brush guard.

[@fincinhalwende3176]

I was most impressed by the T-bar that bolts onto the wheel to be used as a winch should you ever get stuck.

[@tileman17]

got my tan soft top on the JEEP this weekend it looks so good can't wait for yours

[@Greendot319]

Going to pick up my screen on Tuesday, should be restored over next couple of weeks! Enjoy your top!

[@allenwatkins4972]

Old news. Oil bath air cleaners were standard on many vehicles.

[@swanseamale47]

Would a few washers/spacers on the spare wheel give enough clearance? Just a thought.

[@MisteriosGloriosos922]

hello, really love your content, keep working, bro!

[@Greendot319]

thanks a lot! keep on Grinding

[@rodchristian1363]

My 81 series 3 has huge barf filter Still under the bonnet cheers

[@joe3973]

The oil bath air filter may cause fire to exhaust pipes it happens twice to me off road.

[@paulthompson7594]

To get the top up with out bending the bows... Make a spacer to go between the spare tire and its mount. I'm guessing about an inch would do it. Not a permanent modification. Aim small, miss small.

[@martin9711]

Interesting stuff as usual mr Dot Was hoping to see you tackle a combat rim😬

[@Greendot319]

I certainly tackled some combat rims over the last few days! I might film me building one but its not too riveting!

[@martin9711]

That’s the sort of stuff we would love to see Matt , not that we don’t already enjoy what we see Best t Martin

[@TairnKA]

Maybe there's a Mil-spec for how much the lower top bow is to be bent? ;-) I thought one of the headlights could be moved to aid in repairs?

[@pandakahn]

If you flipped the brush guard upside down would it give you enough room to make it work?

[@CanuckErrant]

It looks like there's a few BC-1335 sets up on eBay right now if you're looking for an appropriate set for the Jeep.

[@jamesziegler4383]

Good reporting

[@travisrscott75]

In the picture of the lady painting the star the radio antenna was in front of the back tire

[@thomasdupont1346]

Is it just me, or does the picture of the woman painting the star onto the jeep look like the antennae is mounted forward of the tire well as opposed to behind the tire well as it is mounted in the "factory position"?

[@xiamaramu1538]

I am backwards, a 2,25 petrol has a oil bath filter... a 4.6 V8 has a paper filter. if i use a oil bath per cylinder bank i can upgrade to a better filter unit.

[@Scooterboys]

My Land Rover Series IIA have the same oilfilter.

[@klausuhlig7141]

Oil bath filter got that on my vw buggy

[@wdrankin400]

Is the antenna mount in a different location in that photo?

[@johnqpublic9074]

As someone who works in the engineering field your a bit off on the air filter. As with anything there are trade-offs. The oil bath design as you mentioned is simple and won't clog, however it isn't very effective, and let's fine particles through. HOWEVER, the life expectancy of the jeep was only 6 months, so they didn't care if the engine lifespan was reduced. Paper filters are more effective but clog. Personally I'll trade the extra maintenance of a paper filter for the added bonus of less mess and longer engine life. Cheers.

[@Greendot319]

I think you agreed with what I said in the video! ;)

[@jeffstone7912]

The beauty of an oil bath air filter is that all you need is gasoline to clean it and 30 weight motor oil. Something that is always in the inventory of the army at the time. Also where are you going to find a paper element in a Third World country?

[@robertradley3043]

Nice spare

[@TairnKA]

You may not need to remove the spare completely, just enough to get the bows by? I was wondering if an oil bath unit "requires" new oil or can old oil be used, thinking the only difference is the old oil lubrication properties is lessoned or gone and there's contaminates (metal, water, fuel) and if it's just the former, why not?

[@Greendot319]

old oil is fine too

[@rogerehinger6694]

Then again Willys wasn't making any percentage off the oil bath air filters, but like the disposable razors with a paper filter you bought a replacement every so often. More money!

[@soldtobediers]

5:04 let off on the spare mount bolts & get slack enough for it to deploy. Just another case of adapt & overcome; that's attached to the 82ND Abn. Div. train of thought attached to we 1/504 members. -11b4p of which I was back in '74. Oil bath? Damn Right! And just right for my daily driver '53 Chevy 5 window short bed pickup! Gotta say enjoy it I did!

[@rs2143]

Let me take you back in time farmall tractors had oil bath air filters before the jeep dusty farm fields . And thanks for reminding me I must change the oil in my farm all air cleaner I use mine to mow the field and I have a Pe 95 Willis generator like on mash had it since the late 1970's it has one to you need one of those to .

[@dennislyles9920]

Here's a question for you. When you fill the radiator up and drive it around for a while and then park it. Does any water flow out the over flow while cooling down. Mine will drop down some and stay a little low from the top. It has never overheated.

[@michaelvrooman5681]

Any vehicle without an over flow tank will do that. When heated to operating temp, the coolant will expand a certain amount. That pushes excess coolant out of the overflow outlet. Then when it cools off it contracts the same amount. When you remove the cap the coolant will be lower in the radiator. If you do not want to lose the coolant, add a small aftermarket over flow tank and hook a hose from the outlet under the cap to it. Then add a proper overflow radiator cap. It will catch the coolant when it expands and return it to the radiator as it cools

[@dennislyles9920]

@@michaelvrooman5681 Thanks for the info. I heard that before some time back. But it always nice to hear from others about it. 😎

[@matthewyoung1468]

Have you heard of Kaiser Willys Jeep magazine parts

[@Dixler683]

You are a font of knowledge, I really enjoy your vids. Great jeep. Do you think the G.I. tipped the oil cup , spilled the used oil onto the ground and gave it a quick wipe with a rag?

[@Greendot319]

Absolutely!

[@johndowe7003]

@@Greendot319 you can change out that filter oil once a year or every 5thousand kms

[@smeercat]

No environmental oversight back then