What kind of transmission fluid is used for 1992 Isuzu pickup 5 spd 2.3 l?
A 1992 Isuzu pickup with a 5-speed manual transmission uses gear oil, not transmission fluid. The specific type and weight will be detailed in your owner's manual. However, a common recommendation for manual transmissions of that era is GL-4 or GL-5 80W-90 gear oil. Always check your owner's manual for the manufacturer's recommendation before adding any fluid.