Who is "they"? I don't know about the Duramax, but every GM vehicle I've driven in the last ten years has an oil life indicator. It's very simple: you wait until the oil life indicator tells you to change the oil.
If it's the clowns at the oil change place telling you to change every 3000 miles, consider their motivations. Let's take my wife's Trailblazer, for example. It takes 7 quarts of oil per change and I have to change the oil about every 15,000 miles. If I changed every 3000 miles I'd be buying an extra 84 quarts of oil every 15,000 miles or .0056 quarts/mile. So driving 20,0000 miles per year that's 112 quarts of oil per year. If an oil shop's markup on synthetic oil is 2 bucks a quart, they stand to make an extra 224 bucks a year by convincing me to change every 3000 miles. (Actually I do my own oil changes, but at the current price of Mobil 1 it's still ridiculously expensive to do an oil change.)
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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