Noxian

So I have a 2011 Rubicon

Caught the rear diff cover lip enough to cause it to seep/leak (no drips yet) while wheeling.

Planning taking off the cover applying new RTV and replacing the fluids.

Manual says use 80W90 or 75W140 synthetic for towing, ( maybe tow once a year a max of 140kms) is that enough to require the 75W140

I asked for a synthetic fluid so the dealership sold me Mopar 75W90, is that equivalent to 80W90 dino? Or should I only be running 75W140 which is 75$ a liter

I read that because the 75w90 is syn its equivalent to 80W90 is that correct?

Just want to make sure I don't cause any problems with my warranty since the jeep only has 2500kms on it.

Thanks.

Noxian

I just called another dealership and they don't have a clue either, very frustrating! he didn't even know what constitute towing and if 140kms a year or less would qualify

sa29560

75 w 90 and 80 w 90 are pretty much the same shit. The w 140 i believe is personal preference. If you tow up or down long grades, distances over a few hundred miles at a time, or tipping weight capacity, it might be beneficial. Other than that, it shouldn't matter

RP 75 w 90 front and rear here, for over 20k miles, zero issues. I can usually touch my diffs after driving and they are cool to the touch

Jiblet

The 75w90 is fine. I just wouldn't two too long or too heavy with it.

The conventional 80w90 is OK, too, probably cheaper and good for those who change their diff oil frequently because they do water crossings or wheel constantly.

You wouldn't have any warranty issues using any of the three.

Enjoy the smell when you do the change!

With the stock covers, on level surface, full is when it begins to drip out on you, regardless of the volume.

When the cover is off, wipe it all out and spray in brake cleaner, wipe and let it dry completely, see the write up on the forum for more info.

Take your time and do the RTV right.

Also, be sure you can loosen the fill-bolt before you loosen the drain-bolt!!

Noxian

Thanks guys,