subaru drivetrain fluid change

[rum334]

I'm thinking about swapping out all of my drive train fluids (transmission, center diff, rear diff) with redline 75w90 gear oil on my 2007 subaru impreza 2.5i.

My 5th gear has been very touchy lately and I want my drive train components to last as long as possible. Anyone have any experience with this product?

Also, there 2 different products. There is regular 75w90 and theres 75w90 ns. Which one would better suit my vehicle?

http://www.redlineoil.com/products_gearlubricants.asp

I also heard motul is pretty good with subaru transmissions, any tips?

 

[spaceballs]

It depends on whether or not your diffs are limited slip. I think the NS will be appropriate for the front transaxle, and it depends on which rear you have.

I read a Subaru forum, and they recommended two quarts of a 75w90 synthetic in the front mixed with two quarts of Redline Lightweight Shockproof gear oil. This is what I run. Not sure if it was the new fluid or not, but it has made shifting much smoother. I recommend this mix.

 

[Titan]

In the front transfer case and rear differential, I'd recommend AmSoil 75w-110. Sometimes the 75w-90 seems to make some of these noisy....it did on one of mine and not on the other. The 75w-110 seems about perfect for these cars.

 

[Solo2driver]

+1 for the 75w-110, I had been running Motul Gear300 previously (for like 40K miles, two drains) and was impressed with the improved shift quality and reduced noise from the A***** version.

 

[bulwnkl]

If sticking with Red Line, their NS is the appropriate fluid for the manual transmission, whether 75W-90 or another grade.

Yes, I've used it in my Subaru. It's not as good as Molakule's MTL-R was, but it's good and much better for me than a 'regular' gear oil. Do not use the NS product in the rear diff unless you have a specific reason to based on experience with the regular product and recommendation from Dave at Red Line.

 

[gtx510]

Sube's have transfer cases?

Other than the Suretrac I think all Sube diffs are viscous. STi has a helical front diff?
Viscous diffs don't need the FM additives that a clutch LSD needs, but the extra additives won't hurt.

I'd think twice about LtWt Shockproof for 2 reasons.
The LtWt stuff is too thin.
And how would you know when the calcium particles have been crushed to the point where they are ineffective?

 

[sprintman]

Our Outback has RL 75W90NS in trans and RL75W90 in rear diff. D4ATF in P/S. Much better than factory fluids.

 

[gtx510]

oop, the STi center diff isn't viscous. Electronic clutch I think? I forgot about that...

GL-4/5 in the transmission
GL-5 in the rear diff

 

[meep]

IT DEPENDS on the TRANS. MT has a center diff with viscous limited-slip between front and rear drive. AT is a FWD with a PTO shaft to the rear. Then there's a limited slip device (electronically modulated) from the pto to the rear driveshaft.

M

 

[bulwnkl]

All the Subies labeled "VTD" have a planetary center system. In addition to those labeled "VTD," the turbo A/T Baja has this system. I do not know whether it is employed in the WRX or WRX STi.

The 'regular' A/T has a clutch pack that is electronically controlled and pulsed to divert power rearward. Under normal road conditions it's almost entirely a FWD system.

 

[gtx510]

man, I'm always forgetting about those automatics Sube's...

 

[goixiz]

May i get some recommendations for a 2005 WRX 5 speed Transmission
Im at 45k miles and plan to do change out both the 5MT (manual transmission) and the rear diffs. at about 50-55k miles

thank you

 

[SubLGT]

Originally Posted By: goixiz
May i get some recommendations for a 2005 WRX 5 speed Transmission
Im at 45k miles and plan to do change out both the 5MT (manual transmission) and the rear diffs. at about 50-55k miles

thank you


Have you seen the lengthy gear oil discussions at nasioc.com? Lots of suggestions and user experiences over there.

 

[goixiz]

some ^^^ yes
but i rather not get recommendations from people that assume the best thing is a concoction or a mix of various oils that has no baisis or sufficient testing.

I was hoping since this is a crowd with more oil info has a suggestion that i can follow up on

 

[SubLGT]

For the transmission, I have read favorable reports about Subaru's Extra-S fluid, and Amsoil SVG. In my '05 Legacy I am using MTL-R from Specialty Formulations, but sadly this fluid is no longer available.

 

[Titan]

MTL-R did very well in mine, too.

 

[goixiz]

YES MTL-R was my choice but SF is no longer available so we will have to wait and in the mean time the search goes on