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View Full Version : 75-90 vs 80-90



GJStPierre
01-28-2014, 08:33 PM
Hi, I just purchased my first Miata and I need to do some maintenance.

One of my first tasks is to replace the gear oil and the 1993 calls for 75w-90.
The only reason I'm asking is that I've already got a case of synthetic 80w-90.

Can I use 80w-90 or would that be too thick?

Thanks!