Engine oil effects on vehicle fuel economy. Effect of engine oil viscosity on low-temperature cranking, starting, and fuel economy.

Caracciolo, F. McMillan, M.L.
Society of Automotive Engineers.

1982

1013
CIENA

0-89883-115-6

The effect on engine oil viscosity on low temperature cranking, starting, and vehicle fuel economy at low ambient temperatures was determined for vehicles equipped with four-and-eight-cylinder engines. Oils ranging in SAE viscosity grade from 5W-20 to 30 were investigated at temperatures between -40 and -12ºC. For both vehicles, engine cranking speed increased with decreasing cold cranking simulator (CCS) viscosity. This was reflected in easier stanting with lower viscosity oils. In addition, the maximun viscosity for successful engine starting decreased as the temperature decreased. Fuel economy during engine warm-up increased with decreasing CCS viscosity, with the friction-modified oils investigated providing better fuel economy during warm-up and easier low-temperature starting. ABSTRACT. EXPERIMENTAL. RESULTS AND DISCUSSION. CONCLUSIONS. ACKNOWLEDGMENTS. REFERENCES.

Presenta tbls. y gráfs.

GENERAL; LUBRICANTES; ACEITES; MOTORES DE GASOLINA; VEHICULOS AUTOMOTORES; USO RACIONAL DE LA ENERGIA; EFICIENCIA ENERGETICA; MOTORES DE COMBUSTION;