Zefy Posted January 13, 2010 Share Posted January 13, 2010 i did a search but i didn't really put my heart and soul into it. so here i am asking the question. what fluid should i be using in my 87 RX trans and 87 RX LSD rear diff? I'm sure 75w-90 is fine for the trans. but what about the diff? I've only ever changed the fluid on newer subies with viscous centres and viscous rears. Thinking the RX might be a bit different? i have access to a drum of 75w-90 subaru 'extra-s'. The good shtuff... Quote Link to comment Share on other sites More sharing options...
john in KY Posted January 13, 2010 Share Posted January 13, 2010 (edited) The LSD takes a special lube. I still have some somewhere. I'll post a PN if I can find it. K0904AA080 PN probably obsolete but Anthony's Subaru in BC was able to get it for me about 8 years ago. Edited January 13, 2010 by john in KY Quote Link to comment Share on other sites More sharing options...
Zefy Posted June 10, 2010 Author Share Posted June 10, 2010 bump from the dead... is this the only thing needed for these diffs? or is it an additive? found it on subarugenuineparts.com for 18 bucks for 1liter using your part number. Quote Link to comment Share on other sites More sharing options...
WoodsWagon Posted June 10, 2010 Share Posted June 10, 2010 It's a clutch type lsd, and most auto parts stores should carry gear oil with the LSD addtive already mixed in or bottles of additive. Doesn't really need a special dealer only mix. Quote Link to comment Share on other sites More sharing options...
john in KY Posted June 10, 2010 Share Posted June 10, 2010 bump from the dead... is this the only thing needed for these diffs? or is it an additive? found it on subarugenuineparts.com for 18 bucks for 1liter using your part number. It is the only thing in my LSD. Filled the diff with it 6 years ago and no problem. Quote Link to comment Share on other sites More sharing options...
carfreak85 Posted June 10, 2010 Share Posted June 10, 2010 It is the only thing in my LSD. Filled the diff with it 6 years ago and no problem. Sounds like its about time to change it. Even if you haven't put a ton of miles on it, the used fluid can start to do some bad things if just left to sit. Quote Link to comment Share on other sites More sharing options...
Subarutex Posted June 10, 2010 Share Posted June 10, 2010 That subaru part number looks to be just a bottle of additive, but I could be wrong. When I recently swapped to RX running gear in my wagon, I used some royal purple gear oil, that already had the LSD additive in it. Redline also makes an excellent standalone additive you can use. Quote Link to comment Share on other sites More sharing options...
2K4 STI Posted June 27, 2010 Share Posted June 27, 2010 I used the Subaru Extra-S in the trans and Subaru LSD gear oil in the rear and my RX shifts and feels much better. Quote Link to comment Share on other sites More sharing options...
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