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I actually got into a pretty good discussion with the boys at my own local NAPA when I went in to buy some GL4 last summer - they didn't realize that GL5 isn't an UPGRADE to GL4, it's just a different specification... and they didn't know that GL5 (with its large dose of moly-d) actually slowly...

I hate to dig up old bones... but I also hate to permit misinformation to lie hanging out there ready to snare newcomer after newcomer. MT-1 gear oil is NOT suitable for synchronized manual transmissions, and it's NOT suitable for most (older, at least) transfer cases. GL-5/MT-1 gear oil is no...