Reply to "What is the best ZF transmission oil to use in a 1974 Pantera?"

davidnunnMember

Keep in mind, our gearbox manufacturer’s recommendation is to use 80W-90 GL-4 mineral based oil. Roy Butfoy always kept a drum of Castrol 80W-90 GL-4 in his shop. They have updated their recommendations to allow 75W-90 GL-4 synthetic. Unfortunately, GL-4 gear oils are becoming increasingly more difficult to find. If you decide to use a GL-5 gear oil, mineral based or synthetic, just make sure it specifically states it’s designed to be used in manual transmissions and transaxles. GL-5 gear oils that are designed specifically to be used in differentials are likely too slippery to allow the ZF’s synchros to work properly.

12/26/228:32 AM

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