MT Fluid and Rear Diff Fluid on 2012 Subaru Forester 5-spd MT

Joined
Sep 12, 2022
Messages
5
Hi folks,
I am going to change MT fluid and Rear diff fluid on my 2012 Subaru Forester 5-spd MT. I am planning to use Subaru HPGO 75W-90 on both MT and Rear diff. Does anyone have tried this gear oil on them? I have searched a lot and Motul Gear 300 and Redline 75W90NS are recommended since they don’t contain LS additive. And I don’t know if HPGO contains LS additives. But the HPGO is cheapest and easiest to get in my area, so I am considering to use this. Should I use Motul or Redline? Or do you think HPGO is good enough? Thanks!
 
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Apr 18, 2005
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Yes no LS additive is needed as the LSD is completely self-contained and uses a viscous coupling, R160 is the designation I believe. There is no LSD in the front diff which is part of the manual transmission. Redline is always a good call IMO.
 
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My '04 Forester MT called for 75w90 GL-5. Same for the rear diff and front diff, which is a common sump with the tranny. From what I read, this car has open diffs front & rear (so no clutches), with a viscous coupled front-rear transfer diff. I believe this is different from the auto tranny cars. I changed the oil after 40k original miles, so the diffs were fully broken in. I used Mobil 1 synthetic 75w90 GL-5. 60,000 miles later the oil still looked new, no new metal or sludge on the magnetic plugs.

I've used redline diff/tranny oil in other GL-4 and GL-5 applications, and it has also given me great results, no problems.
 
Joined
Mar 20, 2008
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Welcome to BITOG 🥳

Subaru manual transmissions can be picky with fluid. The best one seems to be Motul Gear 300

The rear diff can use any synthetic 75w90 with no problem, even Walmart brand :)
 

AUKU

Thread starter
Joined
Sep 12, 2022
Messages
5
Yes no LS additive is needed as the LSD is completely self-contained and uses a viscous coupling, R160 is the designation I believe. There is no LSD in the front diff which is part of the manual transmission. Redline is always a good call IMO.
Thank you!
 

AUKU

Thread starter
Joined
Sep 12, 2022
Messages
5
My '04 Forester MT called for 75w90 GL-5. Same for the rear diff and front diff, which is a common sump with the tranny. From what I read, this car has open diffs front & rear (so no clutches), with a viscous coupled front-rear transfer diff. I believe this is different from the auto tranny cars. I changed the oil after 40k original miles, so the diffs were fully broken in. I used Mobil 1 synthetic 75w90 GL-5. 60,000 miles later the oil still looked new, no new metal or sludge on the magnetic plugs.

I've used redline diff/tranny oil in other GL-4 and GL-5 applications, and it has also given me great results, no problems.
If the Subaru HPGO contains LS additives, I will go with Redline NS. Thanks!
 

AUKU

Thread starter
Joined
Sep 12, 2022
Messages
5
Welcome to BITOG 🥳

Subaru manual transmissions can be picky with fluid. The best one seems to be Motul Gear 300

The rear diff can use any synthetic 75w90 with no problem, even Walmart brand :)
Thanks!! I read many people strongly recommended Motul Gear 300. I tried to get it, and called several local dealerships and auto parts store, but they carry only 300LS, which is not ideal for my tranny, I think. Therefore, this time I might go with wither Redline or Subaru Genuine HPGO. Thank you!
 
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