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Old 02-28-2013, 01:45 AM   #1
ImBenDood
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Member#: 227634
Join Date: Oct 2009
Chapter/Region: TXIC
Location: San Antonio
Vehicle:
2006 Impreza 2.5i
SGM - 26D

Default 5MT Front Diff & Rear Diff Oil Question...

I think I have come to the decision that I will go with Valvoline 75w90 gear oil... it seems to be the cheapest and readily available product.

I just want to make sure I have been reading correctly.... I should use the Valvoline 75w90 DINO oil in the front diff/tranny and then I should use the Valvoline 75w90 SynPower full synthetic in the rear diff... correct?
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Old 02-28-2013, 04:16 PM   #2
Concillian
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Member#: 4414
Join Date: Feb 2001
Location: Dublin, CA
Vehicle:
2002 WRX Sedan
Midnight Black

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The rear diff you can use anything.

The tranny is sometimes very particular about what is used. The synchros can be finicky. I've NEVER had good luck with a full syn in the 5MT. Uncle Scotty's Cocktail is the right friction level for my synchros. Use a dino oil in the cocktail. If you can't find Castrol, then Valvoline dino will work. I did a cocktail with syn once... couldn't shift for ****. Dino all the way.

Back in the day, before the cocktail was discovered I did full Redline 75W90NS (BAD), full lightweight shockproof (WORSE) and settled on a dino mixed with shockproof. The small amount of synchromesh in the cocktail really helps the older trannies that have some wear on the synchros. By extrapolation, this should help new synchros stay in good shape.
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Old 03-02-2013, 12:49 PM   #3
Whoa!ShutItDown
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Member#: 191700
Join Date: Oct 2008
Chapter/Region: Tri-State
Location: Cicero, NY
Vehicle:
04 WRX
silver

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I used Subaru Extra-S at 60k for the tranny and rear diff. I believe it was the first change since I got it with 56k, it made shifting slightly smoother. It's not cheap though, like $100 for the amount needed if you buy single quarts. I'm at 120k and still shifts good, I'm overdue for a change so ill be buying a 5 gallon bucket, can't find the link at the moment but I think its like $200 shipped
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Old 03-02-2013, 01:55 PM   #4
ImBenDood
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Member#: 227634
Join Date: Oct 2009
Chapter/Region: TXIC
Location: San Antonio
Vehicle:
2006 Impreza 2.5i
SGM - 26D

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yep, that's expensive... guess I need to call my local subie dealers and see if they sell the stuff by the quart or maybe ill just go with motul 300... seems to be the rage...
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Old 03-02-2013, 10:41 PM   #5
jaxscuby
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Chapter/Region: South East
Location: F L O R I D A
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2002 USDM WRX
WRB

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i have use motul full syn since my first tranny / rear diff service and haven't looked
back since.

242k on drivetrain
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Old 03-03-2013, 06:35 PM   #6
minorc
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Join Date: Apr 2009
Chapter/Region: E. Canada
Location: Ontario
Vehicle:
2010 STi
DGM

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Extra S for me
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Old 03-04-2013, 10:09 AM   #7
wrxman02
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Chapter/Region: Tri-State
Location: Pennsylvania
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2014 Legacy 2.5i
2012 Impreza 2.0i

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Def get Extra S. Cant go wrong. Good luck and be safe
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