Can anyone advise if the rear axle/diff oil is the same for Non LSD and LSD type axles. I have some standard EP 90 gear oil and assume it is ok to use in my 1991 Roadster diff (fairly sure it is a LSD)
If it’s a GL5 spec it’ll be fine.
Thanks Robbie, it is GL5 that I have.
H. Differential Oil
Mazda recommends 75w-90 weight gear oil for the differential, changed at 30,000 mile intervals. Drain the oil by removing the lower (24 mm) plug, and remove any metal contaminants bound to the magnetic insert on the drain plug. Add a new washer (same size as the oil drain plug washer) and plug, then replace the oil through the opening filler (23 mm) plug. Oil should be added to the level of the filler hole (i.e, until the new oil runs out of the fill hole). Filling can be accomplished under the car using a hand pump available at most auto supply stores.Although some users recommend synthetic gear oils, there is insufficient data to determine whether there are any practical advantages to the use of synthetic vs. conventional gear oils over the expected normal life of the Miata. However, if like many of us you want to keep your Miata forever, synthetic differential lubricants probably would not hurt…
Where was the quote from Air_1? Miata.net?
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