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

Dan, before you do anything else, just change the oil in your ZF. Redline admits, most of their GL-5 gear oils are too slippery to use in a manual transmission. You may be experiencing this with the gear oil you're using. According to Redline, MT-90 (GL-4) is the exception. Its intended use is in manual transmissions and transaxles where a GL-4 gear oil was originally specified. When I switched from petroleum based to MT-90 synthetic gear oil, I immediately noticed shifting was easier. Lloyd Butfoy (RBT) says the only problem he finds with synthetic gear oil is, you're more likely to develop leaks.

If you decide to use petroleum based gear oil, keep in mind, the factory recommended spec. is 80W-90 GL-4. Some GL-5 oils may work fine but this is what ZF (and now RBT) recommends. Regardless of what lube you use, RBT recommends you change it annually, regardless of mileage.

RBT

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Last edited by davidnunn
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