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Old 04-24-2006, 09:55 AM   #1
victory by design
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Default Best gear oil and trans oil

Best gear oil for the
summer-
Winter-
all season-

Best trans oil/fluid
summer-
winter-
all seasons-

I heard the mobile one gear oil is garbage, Is this the general consinsus?
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Old 04-24-2006, 10:04 AM   #2
overdose
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try a litre-a-cola
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Old 04-24-2006, 10:05 AM   #3
Jon Bogert
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Quote:
Originally Posted by victory by design
I heard the mobile one gear oil is garbage, Is this the general consinsus?
Depends. The stuff you buy at the auto parts store doesn't seem to work well for anybody. But the Mobil1 "SHC" gear oil is supposed to be pretty good stuff. Factory fill on all new Porsches for one. But you have to find a shop that sells it if you don't have room for a drum in your garage.
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Old 04-24-2006, 10:10 AM   #4
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Yah im wondering the same for my diffs. I FINALLY found the damned dipstick for the front diff (lol!) and the oil is brown and stinky. Almost like its time for new oil.
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Old 04-24-2006, 10:31 AM   #5
victory by design
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How about valvoline oil? I heard good things about that, and redline oil too.
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Old 04-24-2006, 11:33 AM   #6
Jon Bogert
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What, are you posting just to chat?
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Old 04-24-2006, 11:46 AM   #7
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Quote:
Originally Posted by victory by design
Best gear oil for the
summer-
Winter-
all season-

Best trans oil/fluid
summer-
winter-
all seasons-

I heard the mobile one gear oil is garbage, Is this the general consinsus?
The ONLY fluid that should be used in the mechanical rear differential of an STi is the specified Subaru 90LS fluid.

The Subaru 90LS fluid is a straight 90 weight, not a multigrade, and has an unusual appearance, odor, and formulation. It has a very specific additive package that allows the mechanical diff to operate properly. Synthetic aftermarket products that indicate that they are for "limited slip" applications are NOT appropriate for this differential. Apparently there are equivalent fluids in existence that will work, but none that I am aware of that are sold publicly in the US.


Here is a PDF of the specific section of the '04 Impreza STi FSM, for reference:

STi Differential Oil 322KB

It states:
Quote:
Recommended oil:
Except for STi model: GL-5 (75W-90) or equivalent
STi model: GEAR OIL LSD (Part No. K0904AA080) or equivalent
The K0904AA080 has been superceded to part number K0305Y0900.



You can use any GL-5 gear oil in the transmission, but I have had the best luck with the specified Subaru 75W90 Extra-S, and failing that, standard white-bottle Valvoline GL-5 80W90.

I have not had good experiences in all conditions with any synthetic. Some of them work well most of the time. Some do not, and cause 4th to grind.
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Old 04-24-2006, 11:47 AM   #8
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By the way... I'm just curious.

Where did you get the idea that replacement oil would be of benefit in the rear diff of an STi? Please explain your thought process, I'm genuinely interested.
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Old 04-25-2006, 09:15 AM   #9
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Quote:
Originally Posted by Porter
By the way... I'm just curious.

Where did you get the idea that replacement oil would be of benefit in the rear diff of an STi? Please explain your thought process, I'm genuinely interested.

Sorry to say but there is no logic, I just want to change all of the fluids in the car since I just bought it.
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Old 04-25-2006, 09:33 AM   #10
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I was thinking of changing every thing with MOTUL products. All those race teams using it cant be wrong?
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Old 04-25-2006, 10:19 AM   #11
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Quote:
Originally Posted by swede978
I was thinking of changing every thing with MOTUL products. All those race teams using it cant be wrong?
Depends on the definition of WRONG.

Ask Clinton about definitions; either one of them.
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Old 04-25-2006, 02:18 PM   #12
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JDM suretrac VLSD requires GL-5 not 90LS for reference. --keith

and race teams rebuild frequently. look for endurance/baja/24hours racing teams longevity builds for ideas on things like this, instead of drag, auto-x, etc. -keith
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Old 04-25-2006, 04:36 PM   #13
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Amsoil
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Old 04-25-2006, 05:21 PM   #14
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Quote:
Originally Posted by swede978
I was thinking of changing every thing with MOTUL products. All those race teams using it cant be wrong?
They don't use synchro boxes in the WRC.
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Old 04-25-2006, 06:42 PM   #15
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Red line 75w90ns in tranny

Red line 75w90 in rear dif...
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Old 04-26-2006, 08:20 AM   #16
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Quote:
Originally Posted by fastco
Red line 75w90 in rear dif...
In a WRX, yes.

Not in an STi.
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Old 04-26-2006, 09:56 AM   #17
victory by design
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Quote:
Originally Posted by kheff46
JDM suretrac VLSD requires GL-5 not 90LS for reference. --keith

and race teams rebuild frequently. look for endurance/baja/24hours racing teams longevity builds for ideas on things like this, instead of drag, auto-x, etc. -keith
So can I get away with a GL-5 in the VLSD? Or stick with the 90LS?
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Old 04-26-2006, 01:04 PM   #18
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Quote:
Originally Posted by victory by design
So can I get away with a GL-5 in the VLSD? Or stick with the 90LS?
It should be a GL5 in either case. Maybe you mean should you use a multi-grade oil (75W90, etc.) or a straight 90 weight?

-Dennis
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Old 04-26-2006, 02:04 PM   #19
victory by design
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I mean that for the trans can i stick with a 75w90 and on the rear diff a strait 90 not multigrade
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Old 04-28-2006, 09:42 PM   #20
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Why doesn't the owners manual say that the STi diff needs something different? I only states GL-5 90w, 85w or 75w-90.
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