stackman1 Posted April 26, 2017 Share Posted April 26, 2017 (edited) I handle most of my fluid maintenance but am bringing my 2002 Impreza Outback Sport (MT) into my local mechanic and want to buy the proper manual transmission oil . My owners manual chart indicates I will need 3.7 qts of GL-5 85W for the manual transmission. For the rear differential a Haynes book for Legacy and Forester (2000-2006) suggests GL-5 75W-90 and .8 qts Questions: I understand I can use the same fluid for the MT and Rear Differential. Any brand recommendations for the oils? GL-5 85W for both? (If I can't find - just use GL-5 75W-90??? Thanks in Advance - Guys/Gals Pete Edited April 26, 2017 by stackman1 Link to comment Share on other sites More sharing options...
DaveT Posted April 26, 2017 Share Posted April 26, 2017 Same oil doesn't surprise me. I use Amsoil synthetic in everything. Go by the Subaru owners book. Amsoil has reference application guides also. Link to comment Share on other sites More sharing options...
DaveT Posted April 26, 2017 Share Posted April 26, 2017 Oh, change one, change both. Same miles, same time. Link to comment Share on other sites More sharing options...
stackman1 Posted April 26, 2017 Author Share Posted April 26, 2017 Same oil doesn't surprise me. I use Amsoil synthetic in everything. Go by the Subaru owners book. Amsoil has reference application guides also. I was planning on using conventional oil. I have 145,000 miles on it and from what I read the synthetic might be so good it could cause slipping? Link to comment Share on other sites More sharing options...
DaveT Posted April 26, 2017 Share Posted April 26, 2017 I'm not specifically familiar with that model. What could slip in a manual? Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted April 26, 2017 Share Posted April 26, 2017 (edited) There may be some full synthetics that don't work well in the MT, I have read of many people that have 'clashing' because of the difference in synchronizer speed over the use of conventional GL-5 in the MT. some manuals have a different weight listed for the rear diff than the MT, but many folks use the same fluid so, I guess it's what you're comfortable with. Synthetic is fine for the rear diff BTW. Subaru trans oil would be fine, many choices of course. There's a very affordable synthetic-blend at Walmart that some folks use - , I've used Redline Lightweight Shockproof and really like it in my WRX, at present it has Amsoil Severe gear which seems OK - no clashing this winter that I noticed,( but feels more 'notchy/scrape-y' than the shockproof did), all the way up through Motul ...., lot's of fluids/prices. Edited April 26, 2017 by 1 Lucky Texan Link to comment Share on other sites More sharing options...
stackman1 Posted April 26, 2017 Author Share Posted April 26, 2017 I'm not specifically familiar with that model. What could slip in a manual? Good Point Dave. I must have been reading about automatic transmissions with regard to slipping. Link to comment Share on other sites More sharing options...
forester2002s Posted April 26, 2017 Share Posted April 26, 2017 In my 2002 Forester MT, I use Walmart's own brand of 80W90 gear oil. - MT takes 3.5 L - Rear Diff takes 0.8 L I change the oils more frequently than recommended by Subaru. Car is now at 252,000 km, with original gearboxes, and running just fine. 1 Link to comment Share on other sites More sharing options...
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