What you need for a rear differential fluid change - Page 2

Arcticsun · 04-01-2006, 03:25 PM

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

**409industries** · 04-03-2006, 11:25 AM

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

Arcticsun · 04-03-2006, 02:05 PM

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

EricK · 04-05-2006, 02:33 AM

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.

BHazel · 04-05-2006, 07:26 AM

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.

Mykl · 04-05-2006, 07:47 AM

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

i_venegas76 · 04-05-2006, 08:29 AM

I`ll do it at 10, 000 miles

***MKIVSupra*** · 04-05-2006, 09:59 AM

I am pretty sure it is every 30k miles.

i_venegas76 · 04-05-2006, 10:04 AM

Quote:

Originally Posted by MKIVSupra

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.

Mykl · 04-05-2006, 10:15 AM

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

EricK · 04-07-2006, 02:04 AM

Quote:

Originally Posted by BHazel

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.

Chris05STi · 04-07-2006, 06:18 AM

Anyone know where I can pick up Motul 90PA? I heard their stuff is great and want to change the rest out since I am using it for the brake system. Motul 90PA is for the Rear diff correct? What Motul product would be for the trans, and where could I get them all? Also, how much is required for the Diff and Trans (liters?). Thanks!

***MKIVSupra*** · 04-07-2006, 10:48 AM

Quote:

Originally Posted by i_venegas76

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.

That is why I changed mine at 20k with Valvoline 75w90 since my 04 owner's manual said to use that grade. Then I had it changed again during my 30k maint with Subaru's LSD oil that I did not know about before.

Arcticsun · 04-07-2006, 11:24 AM

Quote:

Originally Posted by Chris05STi

Anyone know where I can pick up Motul 90PA? I heard their stuff is great and want to change the rest out since I am using it for the brake system. Motul 90PA is for the Rear diff correct? What Motul product would be for the trans, and where could I get them all? Also, how much is required for the Diff and Trans (liters?). Thanks!

Motorspot.com i believe. I got mine from there, very fast and good price! 25 bucks shipped for 2L (subaru's is 19.95 for 1L). you only need 1L to fill it up.

Chris05STi · 04-07-2006, 10:33 PM

Is that 1L for the rear Diff and 1L for the trans? They use the same oils or? Thanks for the website!

04-01-2006, 03:25 PM	#16
Arcticsun Junior STI Driver Car: 08 Aspen STi Location: Detroit, MI Posts: 123 Join Date: Jan 2006 Trader Rating: (0)	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 This ad is not endorsed by this member. Please register or login to hide this ad.

04-05-2006, 08:29 AM	#22
i_venegas76 Professional STI Driver Car: 2006 Subaru STI Fav Mod: Still stock, until I get more money for them Location: CT Posts: 455 Join Date: Sep 2005 Trader Rating: (8)	I see I`ll do it at 10, 000 miles

04-05-2006, 10:15 AM	#25
Mykl S204 Racer Car: '04.5 STi Fav Mod: ZZYZX Location: Montgomery, Al Posts: 2,751 Join Date: Apr 2006 Trader Rating: (0)	Since I'll be autocrossing and running my car hard at the track I suppose I should change it every ~15k. Last edited by Mykl : 04-05-2006 at 10:18 AM.

04-07-2006, 10:33 PM	#30
Chris05STi I Has a Turbo Timer Car: 2005 Subaru WRX STi Fav Mod: Every single one! Location: NJ Posts: 9,666 Join Date: Jun 2005 Trader Rating: (27)	Is that 1L for the rear Diff and 1L for the trans? They use the same oils or? Thanks for the website! This ad is not endorsed by this member. Please register or login to hide this ad.

04-03-2006, 11:25 AM	#17
409industries DirtyImpreza.com Car: 04 STi, 01 RS Fav Mod: ACPT CFDS Location: Southern California Posts: 672 Join Date: Dec 2004 Trader Rating: (3)	Nice write up. Changing your rear diff fluid is easier than changing the engine oil. A confidence building DIY project!

04-03-2006, 02:05 PM	#18
Arcticsun Junior STI Driver Car: 08 Aspen STi Location: Detroit, MI Posts: 123 Join Date: Jan 2006 Trader Rating: (0)	confidence building until you **** up the temp sensor...yes

04-05-2006, 02:33 AM	#19
EricK Senior STI Driver Car: Soon Evo IX RS Location: Madison,WI Posts: 328 Join Date: Sep 2005 Trader Rating: (5)	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.

04-05-2006, 07:26 AM	#20
BHazel Professional STI Driver Car: 2005 CGM STI Fav Mod: Cobb TBE Location: Waverly, Ohio Posts: 448 Join Date: Feb 2005 Trader Rating: (4)	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.

04-05-2006, 07:47 AM	#21
Mykl S204 Racer Car: '04.5 STi Fav Mod: ZZYZX Location: Montgomery, Al Posts: 2,751 Join Date: Apr 2006 Trader Rating: (0)	What's Subaru's recommended change interval for the rear diff fluid?

04-05-2006, 09:59 AM	#23
*MKIVSupra* Moderator Elite Car: 04 Subaru WRX STi, W Fav Mod: KartBoy SS & Bushings Location: Illinois Posts: 8,745 Join Date: Jan 2001 Trader Rating: (0)	I am pretty sure it is every 30k miles.

04-07-2006, 06:18 AM	#27
Chris05STi I Has a Turbo Timer Car: 2005 Subaru WRX STi Fav Mod: Every single one! Location: NJ Posts: 9,666 Join Date: Jun 2005 Trader Rating: (27)	Anyone know where I can pick up Motul 90PA? I heard their stuff is great and want to change the rest out since I am using it for the brake system. Motul 90PA is for the Rear diff correct? What Motul product would be for the trans, and where could I get them all? Also, how much is required for the Diff and Trans (liters?). Thanks!