I agree with an early 1st time change. In the old days, I guess the thought would be to get any manufaturing / break-in particles out. I'm pretty sure with today's factories there are no left-over metal shavings floating around in a new engine. I'll say this: I have followed the computer on my 2007 Duramax. If I'm towing alot, it tells you to change it more often, if it is all highway miles, I've seen it go 10-14k on an oil change. Almost 170k on it it's getting the best mileage ever. I know of people getting oil analysis to double check and the computer is accurate. It tracks fuel consumption, engine temperature, load (via transmission), etc. I'm sold, and it saves money.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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