Mercedes W166 Differential Fluid Change

[@dagalost1949]

Your videos are the best. You should do a transmission fluid change.

[@letsrolldiyauto1532]

thanks

[@EB-wv9kj]

You have a 14 mm hex shown in the video but you are saying 16 mm. Which one is the correct one?

[@letsrolldiyauto1532]

14mm

[@haixiongwang4608]

How much fluid actually need? Thanks

[@letsrolldiyauto1532]

@@haixiongwang4608 I bought two quarts. Used not quite that much.

[@trailblazer4609]

Thank you for making this great video. I saw somewhere says you need to put a special Loctite on the plugs and it's expensive like $50 or more for a small tube. Did you put anything on or just tighter the plugs? Do you have a video for front differential fluid change too?

[@Drimplant]

I did not use loctite. No issues ok it’s torques properly

[@BlackhawkPilot]

I do the differential and transfer case oil with the transmission every 25K on my GL W166.

[@prandomable]

Might be too often in my opinion...

[@danieleriksson1657]

@@prandomable it's not too often for the transfer case, that contains a chain that wears fast without clean oil.

[@prandomable]

@@danieleriksson1657 look at the service maintenance intervals...

[@7150285]

​@@danieleriksson1657I changed the transfer case fluid today at 122,800 miles (197,600 KM) on my 2013 Mercedes ML-350 4matic for the first time. The fluid was pretty DARK...you are correct. However my rear diff fluid wasn't that bad...and has never been changed either...

[@anthonyaztiptoenailsandspa7259]

Is the front and rear differential using the same type of fluid? Thank you! I have a 2018 Gle 350 4 matic with 55k miles. Is it OK to use mobile1 75w90 like yours?

[@Drimplant]

The front and rear should take the same gear oil.

[@sirisackx1582]

15NM or 50 NM??? torqued. Thank you

[@letsrolldiyauto1532]

50 NM (fifty) on the differential plugs (both).

[@totallybonkers]

FCP Euro says torque to 37 ft lbs.

[@prandomable]

No need to replace the plug...why waste money?? I mean it's not like a crush washer or a rubber washer gasket or o-ring that can only be one time used only...😂😅

[@letsrolldiyauto1532]

Replacing the plug is recommended in the service manual. Do you absolutely have to? No, but they are pretty cheap and meant to be replaced.

[@prandomable]

@@letsrolldiyauto1532 yeah. Make sense. They are super cheap. And to 100% make sure there will be (no leak) is to use new plug...