What type of gear oil for a 1997 3.8 mustang?
The 1997 Ford Mustang with a 3.8L V6 uses 75W-90 GL-3 gear oil in the differential. Some sources might also suggest 75W-140 for heavier loads or towing, but 75W-90 is generally recommended and sufficient for typical driving. Always check your owner's manual for the manufacturer's specific recommendation.