Rooster2 Posted June 18, 2015 Share Posted June 18, 2015 What gear weight lube should I get to change the diff lube in my 2 Subies? I saw two different viscosity diff lubes for sale at my part store, don't know which weight to buy.................Thanks for any help. Quote Link to comment Share on other sites More sharing options...
idosubaru Posted June 18, 2015 Share Posted June 18, 2015 (edited) anything within the owners manual range. 75w-90 is i think what i have. http://www.ultimatesubaru.org/forum/topic/105232-which-gear-oil-for-5-speed-manual/ http://www.ultimatesubaru.org/forum/topic/85343-80w-90-vs-75w90-gear-oil-for-differentials/ http://www.ultimatesubaru.org/forum/topic/116899-differential-fluid-change/ http://www.ultimatesubaru.org/forum/topic/116387-front-differential-gear-oil-tranny-fluid/ Edited June 18, 2015 by grossgary Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted June 18, 2015 Share Posted June 18, 2015 (edited) 80w-90 is the basic stuff, what's recommended in the owners manual. Works just fine. If you want to spend more money on synthetic you can get 75w-90 which offers a bit better cold flow rate. Or if you are hauling heavy loads frequently, get the 75w-140 for better high temp protection. Do not use either of the latter two in the manual transmission. They will cause shifting problems. Fine for use in auto trans front diff though. Edited June 18, 2015 by Fairtax4me Quote Link to comment Share on other sites More sharing options...
Rooster2 Posted June 19, 2015 Author Share Posted June 19, 2015 Ok, thanks guys, then I will buy the 75W-90. Quote Link to comment Share on other sites More sharing options...
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