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What kind of oil is used in 1990 Ford Ranger 5 speed manual transmission?

The 1990 Ford Ranger 5-speed manual transmission uses GL-3 gear oil. The exact weight (like 75W-90 or 80W-90) might be specified in your owner's manual, but GL-3 is the crucial specification. Always refer to your owner's manual for the manufacturer's recommended oil type and weight.