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I have a number of high mileage vehicles in our fleet at work. There is a 97 Chevy 2500 Silverado with a Vortec motor with 750,000 miles on the motor and we have never had a problem with it. I also have a 96 Chevy 2500 Silverado with well over 1.5 million miles (no one is really sure because the od was disconnected for a while (we don't worry about it because we don’t sell vehicles, we run them into the ground, fix them, then do it again). We always change the oil between 5,000 and 7,000 miles and we only use Dino oil (20w-50 in our high mileage trucks). They are still running strong, so for anyone who thinks their car will implode if they go more than 3,000 miles think again.
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