Reply To: Mid 50’s gear lube

[ShortyLaVen]

I don’t have a lot of experience with outboards, but this topic has been around in the classic car world since GL-5 came out. I have always heard about the concern over bronze bushings/bearing, but I know of a lot of people who have been running it in their vintage transmissions for years and the brass synchros don’t seem to be effected much, if at all. Personally I’ve been running it in the Muncie M-21 four-speed in my old Chevy for at least two years, and in the old three-speed for years before that.

I feel like regular wear from use will kill any brass or bronze parts before anything in the oil will. Those yellow metal bushings are likely considered wear-items anyways, right?