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- Jul 2, 2007
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2009 Subaru, manual transmission. Front differential is in the trans and shares the manual trans fluid, so does center differential (AWD). Want to change out the factory OE manual trans oil for synthetic, and also change rear diff oil to synthetic. Front and rear diffs are open type, not LSD.
Subaru says use GL-5 gear oil in both the rear diff (capacity .8 qts) and the manual transmission (capacity 3.7 qts) 75W90 recommended for both.
Was considering Mobil 1 Synthetic Gear Lubricant LS 75W-90 for the rear diff even though it has the limited slip friction modifiers it should be okay for the hypoid geared open rear diff.
But for the manual trans I'm not sure what to use. I know you're not supposed to use any gear oil containing the limited slip friction modifiers in a manual trans, so I need to find a 75W90 GL-5 syn gear oil that will keep the manual trans, front diff, and center diff all happy and long lived.
Subaru says use GL-5 gear oil in both the rear diff (capacity .8 qts) and the manual transmission (capacity 3.7 qts) 75W90 recommended for both.
Was considering Mobil 1 Synthetic Gear Lubricant LS 75W-90 for the rear diff even though it has the limited slip friction modifiers it should be okay for the hypoid geared open rear diff.
But for the manual trans I'm not sure what to use. I know you're not supposed to use any gear oil containing the limited slip friction modifiers in a manual trans, so I need to find a 75W90 GL-5 syn gear oil that will keep the manual trans, front diff, and center diff all happy and long lived.