jktonka

Seems like every time I ask or read it's a different amount or different weight oil
It's a 2012 rubicon can someone tell me a for sure answer

ronjenx

The for sure viscosity is in your owner's manual:

Axle Differential (Front) MOPAR Gear & Axle Lubricant (SAE 80W-90) (API GL-5) or equivalent.

226 RBI (Model 44 Rear) - MOPAR Gear & Axle Lubricant (SAE 80W-90) (API
GL-5) or equivalent. For trailer towing, use MOPAR Synthetic Gear & Axle
Lubricant (SAE 75W-140) or equivalent. Models equipped with Trac-Lok™
require an additive.

Don't pay any attention to quantity numbers.

The important thing is to fill to the bottom of the fill hole with the OEM covers.
If you have aftermarket covers with the higher fill hole, fill to a level just above the bottom of the axle tube, so oil can get to the axle bearings.

jktonka

How do u know if it has trac lok and what kind of additive?

ronjenx

Trac-Lok is a limited slip differential. Since you have a Rubicon, you have a locking differential. No additive required.

tjkamp

75W-90 is much more common than 80W-90. I think they specifically said 80 to try to get people to buy the insanely over priced MOPAR stuff. Been running the Royal Purple (slightly cheaper) (way better (subjective personal opinion)), for 80,000 miles no issues what so ever. If they say 75W-140 will work then 75W-90 will be no problem.

With the Rubi locker there is no limited slip and therefore no additive needed. Royal purple is full synthetic, and does not require an additive even if you have a limited slip.

Hope this helps. Happy Jeeping.

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shabbernigdo

I use 75w90 and i use 1.5Q for the front and 2.5Q for the rear. Have never had any issues.

tjkamp

Same on mine. It can vary depending on how much you get to drain out. Remember it is thick and the gear teeth are intricate. Unless you disassemble the whole differential, not recommended, you will never get every last drop of the old out.

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JayhawkJeep

What I use. Come to terms the first time or two you may puke a bit out your breather.

jktonka

I'm sorry this may be a dumb question but even with the front and back both being 44's the front takes less than the rear?

rob_engineer

no, the front and rear will take the same for the rubi. Non rubi gets less in front. You can't get it wrong. Just fill until the lube pours back out of the full hole.