what is the thought on older tahoes going to synthetic when its at 225xxx miles and you dont know if it has ever had synthetic oil? i have heard that once you use it you cant go back because of the seals.
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Hello everyone, this is my first post. I just purchased a 1996 Yukon with the 5.7 vortec. When I stop in gear the motor runs real rough. If I take it out of gear in park or neutral it runs great. There is no hesitation after you hit the gas in drive or reverse. It only happens when you are...
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