Technical Paper
Fuel Economy Performance of the Highly Efficient Fuel Economy Oils Using Chassis Dynamometer Test
1993-10-01
932690
Fuel economy is one of the most important performance features for modern engine oils. For some time now, fuel efficient engine oils (called Energy Conserving II or EC-II) have been available in the marketplace. However, the performance of EC-II oils is only 2.7% Equivalent Fuel Economy Improvement (EFEI) as measured by the ASTM Sequence VI Engine Test. To meet future industry needs, more fuel efficient engine oils are desirable. In order to achieve this, a study of highly fuel efficient engine oils was initiated. An initial target of 3.9% EFEI was selected and several candidate oils were evaluated, some of which exceeded this target. The oils were evaluated using a chassis dynamometer using the U. S. EPA mode. The test results may be summarized: 5W-30 Prototype Oil containing MoDTC showed between 1.6 and 2.6% better fuel economy than conventional 5W-30 and 10W-30 EC-II oils. There was an optimum viscosity for maximum fuel economy using the EPA testing mode.
