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Old 11-14-2005, 10:48 PM   #1
v_dubs37
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2002 2.5 RS
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Default Recommened Any Gear Lube?

I got to replace my gear tube, and i don't know what to buy. I've heard go things about redline lightweight, but isn't that for more extreme applications. I'm only sporting a 02 RS, but have a turbo setup coming up in January. So i might as well add some heavy stuff or just wait untill I install the turbo. Any opions?

Thanks
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Old 11-15-2005, 12:38 AM   #2
z
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Quote:
Originally Posted by v_dubs37
I got to replace my gear tube, and i don't know what to buy. I've heard go things about redline lightweight, but isn't that for more extreme applications. I'm only sporting a 02 RS, but have a turbo setup coming up in January. So i might as well add some heavy stuff or just wait untill I install the turbo. Any opions?

Thanks
gear tube?

People seems to be happy with redline.
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Old 11-15-2005, 04:54 AM   #3
02redwagone
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Mobil works fine too. (for me)
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Old 11-15-2005, 08:34 AM   #4
LordBass
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There are literally hundreds of of thread on this. I've been reading them for a few weeks and concluded that everybody likes something different. If you're up for a scavenger hunt, try Uncle Scotty's Cocktail (search for ingredients). That seems to be a mix that many agree on.

I have no griding issues and no more serious racing than a few auto-x and an odd TSD, so I see no need to drop ~$50+ in fluids. I'm going to go with NAPA (Valvoline) 80w-90 in the gearbox ($2.79/L) & probably Valvoline Synthetic in the rear diff (~$9/L).
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Old 11-15-2005, 12:33 PM   #5
edjack
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Default GL-5 Only

Whatever you use, make sure it's GL-5 rated, for both manual transaxle and rear diff.

Don't use hypoid lube in transaxle, it'll eat up the synchro rings.
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Old 11-15-2005, 07:05 PM   #6
jac04
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Quote:
Originally Posted by edjack
Don't use hypoid lube in transaxle, it'll eat up the synchro rings.
Here we go again.....
Gear lubes that describe themselves as "Hypoid" lubes are really just EP rated oils (since hypoid gears subject the lubricant to extreme pressures - moreso than other types of gears). By definition, the GL-5 gear oil specified by Subaru is EP rated and thus contains EP additives. Since Subaru specifies GL-5 oil for the transmission, it is safe to assume that they designed the synchros to withstand the EP additives. Furthermore, EP additives do not usually attack yellow metals until the oil temperature reaches about 240 F. While I have not actually measured the oil temperature in my WRX transmission, it should be significantly lower than this.
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Old 11-15-2005, 09:38 PM   #7
edjack
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Dino gear lubes need corrosive agents to bond with the hypoid gears, since they mesh so tightly that they squeeze out the lube. The agent actually etches poclets in the faces of the gears, and the lube can then find a place to lubricate the gears.

True synthetic gear lube (e.g., RedLine) is able to withstand this squishing, and does not need corrosive agents. But, you still need to heed the requirement for GL-5 rated lube in trans and diff.
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Old 11-15-2005, 10:43 PM   #8
v_dubs37
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well now what do you guys recommened for the front diff, and the rear diff? Cause my rs has 70k on it, and from what i know the diffs have never been changed either.

Thanks
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Old 11-15-2005, 11:10 PM   #9
DrD
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I've been running Motul Gear 300 in both the trans and rear diff with good results - it's a decent ester based synthetic, so it's more stable than the pao based ones like Mobil.
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Old 11-15-2005, 11:55 PM   #10
z
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Quote:
Originally Posted by v_dubs37
well now what do you guys recommened for the front diff, and the rear diff? Cause my rs has 70k on it, and from what i know the diffs have never been changed either.

Thanks
front Diff Shares with the trans. I used Castrol Hypoid-C 80w90 in the rear with no issues. Just make sure it's meant for a limited slip diff.
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Old 11-16-2005, 07:21 AM   #11
DrD
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Quote:
Originally Posted by zavigm
Just make sure it's meant for a limited slip diff.
that only matters with the STi - for regular WRX's or the 2.5RS, the limited slip unit is sealed, so you can use pretty much whatever gl5 rated oil you want.
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Old 11-16-2005, 07:56 AM   #12
jac04
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Quote:
Originally Posted by DrD
....for regular WRX's or the 2.5RS, the limited slip unit is sealed, so you can use pretty much whatever gl5 rated oil you want.
My experience is that using an oil with Limited Slip additives in the WRX transmission will lead to gear grinding - the synchros don't like LS additives. Mobil engineering has also confirmed this. So, try to find an oil without LS additives for the WRX/RS transmissions.
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Old 11-16-2005, 12:49 PM   #13
z
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Quote:
Originally Posted by jac04
My experience is that using an oil with Limited Slip additives in the WRX transmission will lead to gear grinding - the synchros don't like LS additives. Mobil engineering has also confirmed this. So, try to find an oil without LS additives for the WRX/RS transmissions.
Actually, I was referring specifically to the rear diff when I mentioned gear oil for LSD.

and DrD, don't you still have to use a gear oil meant for LSD even though it's not a mechanical LSD like the STi? That's what I thought at least.
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Old 11-16-2005, 04:53 PM   #14
jac04
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Quote:
Originally Posted by zavigm
...don't you still have to use a gear oil meant for LSD even though it's not a mechanical LSD like the STi? That's what I thought at least.
As DrD stated - on the WRX/RS it is a sealed viscous limited slip unit, so it is not affected by the type of oil used.
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Old 11-16-2005, 04:58 PM   #15
shemoves
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How often should tranny/diff fluids be changed on cars that are auto-x/tracked 4-5 times a year vs. just driven normal?
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