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Doig

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I noticed another thread said not to use GL5 spec gearbox oil in old triumph gearbox's (It not good for copper bits apparently)

Checking what I put in mine last year it is unfortunately a GL5 spec oil.
Any GL4 oil I can find is only 80 SAE. Is this OK?

What does everyone else use.

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The engine oil idea comes from the different approaches taken to overdrives - Triumph alwasy specified EP90, Healey specfied engine oil as I think did MG. Confusion reigns. I've got Redline's MT90 fully synthetic in mine - just lets me brag a bit (it's all bullshit really), I've noticed no real difference apart from it feels less inclined to get notchy when hot!

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