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I have always broke the engines in the way I was going to drive them. I have a 2000 Monte Carlo 3.8 with 195,000 hard miles on the engine with no problems. I also have only used non-synthetic valvoline from the time it was new. I change the oil every 3000 miles. Changing engine oil types or even brands I have always heard is not a good idea. Hope this helps!! This is how I am treating my 5.7 right now.
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