Why do manufacturers not recommend a fuel additive?

I have worked with Jaguar, Landrover, Volkswagen, Jeep, lotus , seat and Chrysler . I have also tested Redex, liqui molly, Diesel blast and mannol.
Why are these not recommended ?
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/ @glchow

[@Azureecosse]

Been using Redex injection cleaner for over 40 years and my Grandfather before me had been using since the 60s he was a racing Engineer, used in everyone of my cars all Hondas ever since, I use it in my 2020 CRV with a GDI turbo engine the car runs cleaner and smoother and does improve my MPG it does not improve power output or anything like that and nor do I expect it to, I pour an entire bottle in after every oil change around 4,000 miles, Fuel cleaner additives are a must in my opinion more so on modern cars with GDI non port injected vehicles that rely on modern Bio Ethanol based fuels that create more Carbon and corrosion than any fuel before them, I don't care what the manufacturers say its my car and I put in it what I want, I too am an Engineer, I would not put anything in my cars system I did not trust or tested or would cause harm to my engine.

[@glchow]

Thanks for your input.

[@K.Bush94]

Some might say snake oil, but I use mannol additives for like 3 years now. I use burning booster (for gasoline) and no matter if I use e10 here in Hungary or E0 in Ukraine, my Suzuki (previously a 2001s swift, now a 2007s SX4) goes great with it, and the fuel consumption is a bit better too. I use it mainly to preserve the fuel system. The ceramo ester for the oil also worths a shot as being cheaper than the big brands. Thanks for your review. When I fuel up in Ukraine, I can feel that ethanol free gas gives better milage. Even a half of a tank can be felt.

[@glchow]

Thanks for your experience with this product. I will trying a different product soon to compare

[@peterlawrence3152]

Millers Eco Max Diesel worked great in my L200 and VW T5. Turns supermarket fuel into V power for significantly less money. UK product too.

[@glchow]

I'm currently testing millers, and my feelings so far is that there is plenty of cleaning agents, but the performance is poor compared with mannol super diesel

[@EppingForest304]

I buy a bottle of Redex petrol treatment whenever it’s on Clubcard discount at Tesco. Fifth gear TV show reckon it cleans the fuel system & you therefore get a small power recovery! I’ve no idea if it genuinely does any good !? 👍

[@glchow]

From what others have commented on the various videos the consensus is very little. Check out my video on mannol super diesel. That does work!

[@las3k91]

Manufactureres do recommend fuel additives, but only if they sell them. Like BMW for example.

[@glchow]

This is more that likely the retailer looking for some upsell. I would imagine BMW the manufacturer do not have a recommendation?

[@justso1823]

I recently looked at 1.5dci Dacia duster 2018 . I actually found in the service history a fuel treatment additive had been done by Renault. Followed by a test drive.

[@glchow]

So some franchises would recommend to use a fuel additive. I have had experience where they would charge a expensive price for the product and charge you to pour it in the tank. Maybe this one was incorporating a test drive to justify the cost?

[@MoizZahidChohan]

The other thing I thought about was if these additives with added detergents are added to the fuel tank and they do breakdown soot/deposits etc, i can only imagine they would cause trouble downstream i.e turbo / sensors.

[@glchow]

Well the fuel already has detergent in so only problem could be a build up of detergent.

[@micksumo]

I've used the standard cebo on my 2.0 litre skoda superb diesel largely because since covid the dpf light would come on all the time. This has now pretty much taken that problem away. I've just bought some of the maximus as the car is going on a long trip to Scotland soon. I've tried redex, still amongst others and they did nothing. I swear by hydra additives now.

[@glchow]

Let me know how you get on with the Maximus. Maybe I should review it?

[@glchow]

Thanks for your support for the channel. Comment below if you have any questions?

[@paulgilraine3127]

Thatnks for this video i think you will have saved me some money, ive seen a few videos lately with people adding 2 stroke oil to there diesel to help with lubricity ,whats your views on using 2 stoke

[@glchow]

I’ve not tried it. I’ve heard taxi drivers add up to 5ltrs of petrol to a tank to get better mpg. If both mix with the diesel then they probably would work BUT my worry is that if the car is not used for a couple of days the fuel will separate and the pickup is at the bottom of the tank so the first gulp will be of the least dense fluid. If the engine is common rail this could cause damage to the high pressure pump and then the injectors. It’s not going to be something I will test currently.

[@paulgilraine3127]

Thanks for the reply. From what I have seen on the videos I've watched two-stroke mixes well and stays in suspension in diesel as long as it's not synthetic two stroke but like you have mentioned I'm sure there will be a chance it could do some damage so it's not something I will be testing on my own car but I might on my works van . Just a small bit to see if it makes any difference to the mpg or the way it drives , I don't think it will do any damage as I drive the van every day and only drive my car at the weekend .

[@robertpaget809]

😂 manufacturers can’t also tell you the parameters of a worn used engine Been using engine cleaners for nearly 30 years kept my engine cleaner especially at M.O.T time when my additive has kept my Deisel emissions well below manufacturers results

[@glchow]

Thanks for your feedback. Every bit helps

[@kayali8842]

I tried hydra pic-24 addictive and it made no difference tbh. Just increased the placebo effect in my head

[@glchow]

The placebo effect is real. The hydra has some great reviews on Amazon so people believe it is working. The numbers say it doesn’t.

[@kayali8842]

@@glchow put it this way, note down your mpg before putting in the hydra cleaner and then after 1 week check your mpg. I bet it will be the same or few more becouse your brain is telling you the car sounds smooth, car drives smooth, even smells smooth lol so u drive more carefully and that’s the few mpg increase u will see

[@rokkz]

What’s ur opinion of shell vpower diesel versus standard fuel with high quality additive, for regular use ?

[@glchow]

Sorry to be uncommitted but I’m on the fence with V power. When I have had customers with fuel related failure and I have advised them to use better fuel 90% use v power and nothing else. On the other hand the cleaner your engine the better.

[@guugu90]

what do you think the impact of adding an ethylhexyl nitrate to a modern common rail diesel engine. Read to several research paper it seems positive, but still got some hesitation on it.

[@glchow]

It’s one of the ingredients in Mannol super diesel , which I tested here kzbin.info/www/bejne/nKHLl6SjqrKqlac It was amazing, I’m now testing a different additive, and the loss of power/economy is noticeable. I will need to test it over the winter because I used it for 6 months over the summer which is always positive for diesel engines.

[@herobo123456]

Good Vid keep it up

[@glchow]

Thank you for the feedback 😊

[@Funkydood]

BERRYMAN'S B-12 CHEMTOOL: $4.95, and THE best stuff in the world to clean valves, fuel injectors, etc.!!!

[@glchow]

This looks like a intake cleaner rather that a fuel additive?

[@mirceapopescu7620]

Is good PREMIUM DIESEL 55 S ?! FOR BMW X3 F25 XDRIVE 2.0D , 2012 ?!

[@glchow]

Premium diesel is better than non premium, but it’s good to change the brand every 2k

[@SelectTaxi24]

Dpb 100 best ever

[@glchow]

Thanks for commenting

[@herobo123456]

Subscribed👌

[@glchow]

Thank you for supporting the channel

[@najsuroviji]

Kia does recommend

[@glchow]

Interesting. What do they recommend?

[@najsuroviji]

@@glchow to be honest I don't know which brand specifically (if they do recommend any brand at all) but I'm pretty much sure the manual advises pouring additives once in a while, same as for regular oil checks.

[@fuglbird]

I did never understand when you were talking about diesel engines and when you were talking about petrol engines. It said diesel on all the cans, so you were probably talking about diesel engines, which don't interest me at all. What a waste of time.

[@glchow]

Thanks for feedback