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What type transmission oil 1990 5 speed manual Jeep Wrangler?

A 1990 Jeep Wrangler with a 5-speed manual transmission typically uses GL-4 75W-80 or 80W-90 gear oil. However, always check your owner's manual for the specific recommendation from Jeep. The manual will give you the exact specifications and capacity for your particular vehicle. Using the wrong type of gear oil can damage your transmission.