What kind of oil for a 1992 wrangler jeep manual transmission?
For a 1992 Jeep Wrangler with a manual transmission, you should use GL-4 gear oil. The specific weight will depend on your climate. Check your owner's manual for the recommended weight, but commonly recommended weights are 75W-80 or 80W-90. Using GL-5 gear oil is generally not recommended for manual transmissions in older Jeeps as it can damage the synchronizers.