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Rear gear oil on a 1991 Z28 Camaro?

The 1991 Camaro Z28 used a GM 75W-90 GL-5 gear oil in the rear differential. However, you should always double-check your owner's manual for the exact specification recommended by Chevrolet for your specific vehicle. The capacity is typically around 2.5 - 3 pints but again, consult your manual to be certain. Using the incorrect type of gear oil can damage your differential.