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alexlula
02-06-2015, 06:19 PM
Wht do you guys think about Royal Purple Synchromax for my tranny and what oil should i use for my Diff???
kung fu jesus
02-06-2015, 07:10 PM
What year? Just an observation, not science...the early Miatas seem to like dino oils in the transmission. My '92 felt better with a quality non-synthetic oil than with. My NB was the opposite. I believe it is necause of the metals. YMMV.
BoBo
02-06-2015, 07:28 PM
Redline mt-90 or GM syncromesh for tranny, but most GL-4 or 5 for diff will work. This is just from my experiences with a few miatas.
kung fu jesus
02-06-2015, 08:02 PM
I really liked the Ford syn sychromesh in the NB 6 speed, fwiw.
Pyr0monk3y
02-06-2015, 10:35 PM
Redline MTL turned my shifter to butter (that's a good thing).

Redline 75W-90 has kept my differential quiet and acting right for two seasons now.

In my experience, royal purple is overpriced. People buy it because it is locally available and marketed as premium stuff, and it isn't bad. But, Redline is available at carquest by special order. It's as good or better than royal purple and it is usually cheaper.
Hyper
02-07-2015, 01:05 AM
Ford Motorcraft transmission synthetic oil. You will love it.
alexlula
02-07-2015, 10:52 PM
its 92! my shifter is stiff specialy with the second gear and it tends to grind enev with my foot floored on the clutch (NO CARPET) and a few people told me that the SYNCHROMAX from royal purple is good in the NA
wannafbody
02-08-2015, 10:17 PM
Amsoil MTG if you can find it
kung fu jesus
02-09-2015, 08:35 AM
its 92! my shifter is stiff specialy with the second gear and it tends to grind enev with my foot floored on the clutch (NO CARPET) and a few people told me that the SYNCHROMAX from royal purple is good in the NA


A lot of people mistake a stiff transmission on the oil. Often it is more the fault of failing hydraulics (clutch master and/or slave cylinders) or bad engine mounts.