Engine oil effects on vehicle fuel economy. Fuel economy benefits from modified crankcase lubricants.

Society of Automotive Engineers.
Retzloff, J.B. Pietras, J.M.

1982

1013
CIENA

0-89883-115-6

Techniques to accurately measure fuel economy have been used, and statistical techniques have been developed to demonstrate that relatively small differences in fuel economy can be evaluated using EPA City and Highway cycles. A friction modifier that gives up to 5-percent improvement in fuel economy, depending on the lubricant formulation and vehicle used, has been developped. The effect of test conditions and changes in the additive package on the performance of this friction modifier have been studied. A reduced-viscosity oil, formulated using a synthetic olefin oligower to overcome potential volatility problems of a corresponding viscosity mineral oil, also improved fuel economy. This benefit was further enhanced by the addition of a friction modifier. The improvementes demonstrated in EPA test have been confirmed in field tests, which are continuing. INTRODUCTION5BENCH SCREENING TESTS. LVFA. 4-Ball Machine. SELECTION OF FRICTION MODIFIERS. CAR EPA TESTS. TEST RESULTS. Induction Time and Carryover Effects. Response of a Friction Modifier Under Different Operanting Conditions. Response of a Friction Modifier in Different Cars. Effects of Other Lubricant Additives on Friction Modifier Response. Effects of Base Oil and Formulation Changes. on Fuel Economy. Effects of Viscosity on Fuel Economy. FIELD EVALUATION OF FRICTION MODIFIERS. EFFECT OF FRICTION MODIFIER ON SEQUENCE TEST PERFORMANCE. CONCLUSIONS. REFERENCES.

Presenta tbls. y gráfs. Documento presentado en el Annual Meeting [34, 30 Abr.-3 May. 1979, Missouri]

GENERAL; LUBRICANTES; ADITIVOS; PRUEBAS; AHORRO DE COMBUSTIBLE; VEHICULOS AUTOMOTORES; USO RACIONAL DE LA ENERGIA; EFICIENCIA ENERGETICA; MOTORES DE COMBUSTION;