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Redline synthetic gear oil. Perfect for all stock Miata differentials, including all types of factory limited slips as well as aftermarket clutch-style limited slips. Slightly thicker than the stock ND diff fluid, which should give better protection under hard use.
Works well in all Miata differentials from standard to viscous (90-93) to Torsen limited slips (94+). One quart required. Not for use in the transmission, use either MTL or MT-90 there.