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I think it's important to note here that the only reason I would run the GL-5 (MT-1) stuff in my tranny is for convenience ...I don't want to buy different lubes (I'm lazy). There is no specific benefit of GL-5 running in a gearbox...it's made for differentials with high pressure gears (hypoid...

I assume you're talking about the gear lubes...You'd need to filter it well (there will be microscopic metal shavings in there) and dilute it well, but it should work. The important thing is to thin this stuff out well...it's pretty thick stuff, and typically contaminated with all kinds of...

...oh, and I did see a post about the Carquest GL-5. Current thinking is that it's made by Valvolene and packaged for CQ, and should have the MT-1 rating (as their offering does).

Must have the MT-1 rating to be yellow-metal compatible. I was trying to say that almost all of the new stuff will have this rating as it's pretty much all that is manufactured anymore. There is a lot of old info out there that has persisted and become muddled with the new (as the starting...

GL4 is the "official" replacement for GL-1 (did not have as much of the high-pressure additives at GL-5, which caused the yellow-metal incompatibility). GL-5 with MT-1 rating is compatible with GL-4. I just purchased 5 gallon pails of "GL-4/GL-5 MT-1" 80/90wt from Costco. Basically multi-use...