I have two Duramax units - a 2006 and a 2005. I have done a lot of pulling with both and I do not have an oil useage problem. I change oil around 5-6 K and I do oil anaylsis samples - always. I have never had to add oil. With 13000 miles I would go back to the dealer and have it checked. On my 2005 unit I ran it until oil change indicated to change. It had over 13,000 miles on it and that's bit much in my book on the type driving these typres of units usually get. I use Shell 15-40 Rotella.
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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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