Do you think it would be worth while to say run on that oil for a 100 miles or so, then change it again? That might make sure you flush out all the old oil and filings. Just a thought.

 

Good call on loosening the filler plug first Imagine draining out all the diff oil and then not being able to fill it because the filler plug is seized!

 

Do you think it would be worth while to say run on that oil for a 100 miles or so, then change it again? That might make sure you flush out all the old oil and filings. Just a thought.

Yah it might, but at $19 a liter I'm not jumping to do it : )

 

004403010 - Three Bond 1105 (liquid gasket)

Just wondering what else I could use instead of this. Something I could pick up at any autoparts store.

 

Just wondering what else I could use instead of this. Something I could pick up at any autoparts store.

Do a google for "three bond" and "substitute" and you should find some. Certain manufacturers list substitutes for competing products.

 

Good call on loosening the filler plug first Imagine draining out all the diff oil and then not being able to fill it because the filler plug is seized!

Had that happen once

Very good to pull the fill first

 

K0305Y0900 - LSD (75W-90 GLS), previously K0904AA080
004403010 - Three Bond 1105 (liquid gasket)
Large adjustable wrench or corresponding socket (not sure on size)
1/2" breaker bar
Hand Pump
Fluid Extractor (optional)
Torque spec on plugs: 49.0 N·m (5.0 kgf-m, 36.2 ft-lb)

I I pulled the top plug first (pull the sensor harness first) to make sure it wouldn't give me any trouble.

How does that sensor get pulled

 

Thanks - I got it done Mobile Syn in the diff, trans lube next with my Kartbot ss install

 

Thanks - I got it done Mobile Syn in the diff, trans lube next with my Kartbot ss install

The rear diff requires a 90 wt. LSD oil, which Mobil does not make, so it sounds like you put the wrong stuff in. You need to use Subaru 90 wt. LSD oil or Motul 90PA LSD oil which is an equivalent.

 

Nice post Singletrack

I just got done reading this and the trans thread and wanted to say thanks for the heads-up on the gasketsfor the trans, along with pointing out the appropriate liguid gasket. I did some checking and was a bit surprised that the Three Bond Subaru recommends for the rear diff is not the same as Permatex ultra grey. Glad you brought it up otherwise I am certain I would have used the wrong stuff without having any clue.

I know there will be people saying no big deal, and they may be right, but why risk it when Subaru specifically endorses Permatex ultra grey as an appropriate substitute for a host of other applications, just not for the rear diff.

Thanks again. (no, I am not posting appreciation in both threads)

 

Excellent write up. Much appreciated.

 

The rear diff requires a 90 wt. LSD oil, which Mobil does not make, so it sounds like you put the wrong stuff in. You need to use Subaru 90 wt. LSD oil or Motul 90PA LSD oil which is an equivalent.

Just to kind of piggy-back what you said. You can use Silkolene BOA90 LS as well. I like both Motul and Silkolene.

 

Just a quick FYI. These "plugs" referenced here for torque specs is incorrect, there should only be ONE plug with that spec and its the 1/2" drive one (drain).

32.6 breaks the temp sensor plug. I dont know if this is common knowledge in this thread, but i certainly feel like an idiot now :/

 

Just a quick FYI. These "plugs" referenced here for torque specs is incorrect, there should only be ONE plug with that spec and its the 1/2" drive one (drain).

32.6 breaks the temp sensor plug. I dont know if this is common knowledge in this thread, but i certainly feel like an idiot now :/

Good point! I hope you didn't break it.

 

Yea, i broke it, the threads are stuck into my diff, so I gotta take it to the dealer on monday. Stupid on my part, i went 1/2 a turn too much .

To make matters worse Im currently at a little car meet in chicago and i backed into my friend at a gas station earlier today, Gonna need a new bumper

 

Nice write up. Changing your rear diff fluid is easier than changing the engine oil. A confidence building DIY project!

 

confidence building until you **** up the temp sensor...yes

 

I changed the rear diff oil last weekend using the genuine LSD fluid.What came out was so nasty,have no idea what it was.Was very thin & black.The new fluid is like thick honey.The rear diff acts a lot better also.

 

I am changing the diff fluids next weekend with Amsoil Severe Gear 75W-90 oil.

It is much cheaper than the $19/L that someone was talking about and I hope it is better.

 

What's Subaru's recommended change interval for the rear diff fluid?

 

I see

I`ll do it at 10, 000 miles

 

I am pretty sure it is every 30k miles.

 

yes you are rigth

I am pretty sure it is every 30k miles.

The manual recomend it to be done at 30,000 miles, but by then the oil on the rear has become very thick and messy, atleast that`s what a subaru tech told me.

 

Since I'll be autocrossing and running my car hard at the track I suppose I should change it every ~15k.

 

I am changing the diff fluids next weekend with Amsoil Severe Gear 75W-90 oil.

It is much cheaper than the $19/L that someone was talking about and I hope it is better.

You must use one of the three fluids listed above for the rear LSD diff.You need to use Subaru 90 wt. LSD oil or Motul 90PA LSD oil or Silkolene BOA90 LS.If you dont your rear diff. will lock up at strange times or be noisy.