Transmission oil

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carbuff

Member
Joined
Sep 8, 2024
Messages
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Location
Upstate New York
My manual transmission rebuilder says not to use synthetic oil on the transmission; but I saw a thread suggesting Redline MT-80 which is a synthetic oil. It advertises to be used in manual transmissions.
 
I have an 883.

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Mineral base GL-4 (not GL-5) in SAE 80W-90, 90 or 140.
Since you're upstate (where?), 80W-90 will be fine. Unless you drive only in hot weather and do foot to the floor power shifts, SAE 140 is unnecessary.
Several choices at Summit, from cheap to expensive. Others available elsewhere.
Sta-Lube was recently a good option, but I'm not seeing it available at a reasonable price.

PennGrade 1 77296 PennGrade Multipurpose Classic GL-4 Gear Oil | Summit Racing
Driven Racing Oil 04530 Driven Racing Oil GL-4 Gear Oil | Summit Racing
Richmond Gear RICHGL4 Richmond Gear GL-4 Gear Oil | Summit Racing
VP Racing 2703 VP Racing Classic GL-4 Gear Oil | Summit Racing
 
Over the counter 80W-90 as suggested for cooler climates, 140 for hotter climates or hard usage. I've never run the high name brand stuff because of the differences in pricing. I can buy the generic stuff at my local parts store much cheaper and it's never failed me.
 
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