iv_05gt Posted December 30, 2010 Share Posted December 30, 2010 I've been looking through the threads trying to figure out what to put into my trans/diff. My Owners manual is telling me 75W/90 in the trans/diff. Does the rear require any special LSD addatives? Any suggestions on oil to use? Link to comment Share on other sites More sharing options...
ObiWanToby Posted December 30, 2010 Share Posted December 30, 2010 Some people were going with walmart branded supertec stuff (good supplier), good results. Amsoil has been pretty popular as well. The rear differential does not require any special additives. The LSD itself is sealed. I also gathered that 75W110 is the new 75w90 due to some specification change. I'm a fan of using whatever is decent for the lowest price. The walmart experiment is pretty sweet. http://legacygt.com/forums/showthread.php/experimenting-wally-world-supertech-75w-90-88763.html? Link to comment Share on other sites More sharing options...
jasejase Posted December 30, 2010 Share Posted December 30, 2010 big fan of the extra s.... in the front at least. Link to comment Share on other sites More sharing options...
SBT Posted December 30, 2010 Share Posted December 30, 2010 I'm using Extra S front (tranny/diff) and rear (diff). - Pro amore Dei et patriam et populum - Link to comment Share on other sites More sharing options...
jasejase Posted December 30, 2010 Share Posted December 30, 2010 i have heard good thinks about the redline for the rear. but i have also heard extra s is good in the rear too. that sounds interesting now that i read it back Link to comment Share on other sites More sharing options...
Mega Users seabass07 Posted December 30, 2010 Mega Users Share Posted December 30, 2010 The requirement is GL5. So take your pick. Redline, amsoil, royal purple, extraS. At least for the rear diff it probably will not matter too much as long as it is GL5. I've got redline in the front (5eat) and back. It does not require any LSD additives, but for some reason redline recommends their LSD friction modified fluid for the front and rear diff of the auto. Link to comment Share on other sites More sharing options...
CB-M3 Posted December 30, 2010 Share Posted December 30, 2010 I got the Amsoil Severe Gear. But lot of people vote for the Subaru ExtraS OEM fluid. Link to comment Share on other sites More sharing options...
PoisonousBeef Posted December 30, 2010 Share Posted December 30, 2010 I run Amsoil Severe Gear in front and rear. Be aware that not all of the gear oils, even branded synthetics, meet the various specs that might matter to you. The spec "trio" if you will comes from 2 API specs (GL-5 and MT-1), and some people like to add in the Mil-Spec PRF-2105E. The Mil-Spec might be superfluous since it is essentially a combination of the 2 API specs, but the MT-1 specification can be important because, among other things, it requires better oxidation stability. I don't know the list of gear oils that meet MT-1, but if you are shopping for a new brand you might look into that. No clue whether ExtraS is MT-1. Link to comment Share on other sites More sharing options...
iv_05gt Posted December 31, 2010 Author Share Posted December 31, 2010 Thanks for the info. I think im gonna give the supertech a go. for the rear diff, and do the coctail from nasioc in the trans. Link to comment Share on other sites More sharing options...
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