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The Canucks say that GL5 has something in it that can damage the brass synchros. I'd go by what the FSM says. My $.02.


There is an " GL-4, GL-5" oil sold at Advance.
Is it okay if the spec calls for GL-4?

I couldnt find GL-4


1989 5 door montero 3.0 auto
stock original Japanese
about 200k miles