Effect of Heavy-Duty Oils On Engine Wear in Typical Passenger-Car Service

THIS paper presents the results of a controlled field test of heavy-duty crankcase oils in a fleet of 15 Chevrolet cars. Operating conditions were selected to represent average or typical passenger-car service.

After 15 months of operation (approximately 14,000 miles on each car) it was found that, in comparison with the results obtained with a nonadditive oil, a heavy-duty oil of MIL-0-2104 performance level reduced piston-ring wear by 37%, reduced cylinder-bore wear by 42%, and significantly improved engine cleanliness.