Flushed rear diff today...

**hmmrdwn** · #1: 08-31-2012, 04:10 PM

Our car has 36K and a good friend is a Subaru mechanic. He recommended flushing the rear diff to get out metal shavings and said they are basically worry free after that. The diff plugs take a 10MM hex head and are torqued pretty damn tight. Take off the fill plug first...to prevent complications later. It wouldn't be good to drain the diff and not be able to get fluid back in.

The drain plug had a pretty fair amount of metal shavings attached to the magnet. The fluid was dark, but had good viscosity. Refilled with Mobil Sythetic 75W-90 gear lube. I hate working with that stinky stuff.

**minuccims** · #2: 08-31-2012, 04:17 PM

a happy diff

**Jsmith** · #3: 08-31-2012, 04:19 PM

How much does gear oil does it hold? May be doing this tomorrow. Not sure if it says it on the manual but asking here is easy enough

**minuccims** · #4: 08-31-2012, 04:28 PM

I posted the amount last. week. it's like .8 liters. Stand by, I'll search for it...

**minuccims** · #5: 08-31-2012, 04:30 PM

6MT Tranny:
Tightening torque:
44 N·m (4.5 kgf-m, 32.5 ft-lb) (Aluminum gasket silver) (this is the one gotten from the dealer)
70 N·m (7.1 kgf-m, 51.6 ft-lb) (Copper gasket brown)
70 N·m (7.1 kgf-m, 51.6 ft-lb) (Metal gasket black)
Gear oil capacity: 3.7 liters (3.9 US qt, 3.3 Imp qt)

Rear Diff:
Oil capacity: 0.8 liters (0.8 US qt, 0.7 Imp qt)
Tightening torque: 49 N·m (5.0 kgf-m, 36.1 ft-lb)

**Jsmith** · #6: 08-31-2012, 04:36 PM

Thanks minuccims!!, after reading that I remembered I read you thread last week, thanks for the info and sorry that you had to repost it.

**Jsmith** · #7: 08-31-2012, 05:20 PM

Can I put any 75w90 gear oil in and just be done or do I need to put any additives in as well? I am thinking about mobil1 or royal purple.

**acumenhokie** · #8: 08-31-2012, 06:23 PM

Extra S FTW!

**minuccims** · #9: 08-31-2012, 06:50 PM

+1

**hmmrdwn** · #**10:** 08-31-2012, 09:30 PM

Quote:

Originally Posted by Jsmith

How much does gear oil does it hold? May be doing this tomorrow. Not sure if it says it on the manual but asking here is easy enough

I pumped in a quart and put the waste back in the same container.

**AZP Installs** · #**11:** 08-31-2012, 09:55 PM

Quote:

Originally Posted by Jsmith

Can I put any 75w90 gear oil in and just be done or do I need to put any additives in as well? I am thinking about mobil1 or royal purple.

No additive needed on these cars.

Amsoil Severe Gear or Subaru ExtraS work well.

-Mike Paisan

11+ Years Maintaining, Modifying and Educating TriState Subaru Enthusiasts.
Call directly as We carry almost every manufacturer now, so before you buy parts call us.
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**Jsmith** · #**12:** 08-31-2012, 10:27 PM

How much is a quart of Subaru ExtraS and is it available at the dealer only? Is this the factory fluid or is it better?Any details about it are appreciated. Thanks in advance guys, JSmith

**SuberManGT** · #**13:** 09-01-2012, 01:30 AM

I recently got the Extra S from infamousperformance for 15 bucks per quart.

**Aaron48** · #**14:** 09-01-2012, 08:52 AM

If the rear is due at 36,000 wouldn't you do front and rear at the same time?

**minuccims** · #**15:** 09-01-2012, 09:51 AM

Front diff on a 6MT is part of the 6MT. See earlier post.

For a CVT, the front diff is filled with 1.4 liters of
Subaru gear oil Extra S 75W-90 (GL-5) Oil