15W40 conventional or 5w40 sythetic are the GM recommended oils for the Duramax Diesel engine, right out of my owners manual. 10W30 is specifiaclly not recomended in the owners manual. I've had two Chevy's with Duramaxs. Totally trouble free, best diesel engine on the market.
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Today's Featured Article - Horsepower Defined - by Staff. Indicated Horsepower This represents the power developed in the enine cylinder as obtained from the pressure in the cylinders. This is pressure obtained from an indicator which shows cylinder pressures. Indicated horsepower does not represent the actual useful power delivered by the engine. Brake Horsepower This is the actual horse power delivered by the engine to the shaft. It is equal to the "indicated horsepower" less the friction of the engine. It is useful hor
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