What is the recommended tranmission oil weight for a 1983 RX-7 5 speed? When I read the Chilton book I find SAE 90 EP gear oil for temperatures in my region. Thank you
I put 90 weight in mine when I rebuilt it- 'cept I put the fancy BG synthetic
GL-4 or GL-5 SAE90 is the correct grade, I'd go for GL-5 myself as it has a higher anti-scuffing additive content, which does suit a high mileage transmission better.
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