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Like Redneck said - use the oil type, viscosity, and quantity of oil specified by the manufacturer. We spend more than a year testing before changing an engine oil and everything about the lubrication system is designed to match the specified oil. Too heavy, too light, or wrong type can easily destroy an engine.
In controlled testing dropping the viscosity of the engine oil one step is good for about 1.5% fuel economy savings. (For example going from 10W-30 to 5W-30)
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