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Originally Posted by mhingram
13000 miles between changes is to long i am sure with syn oil it is okaybut that seems to long to me.
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Provided it is supported by oil analysis or some form of analysis such as those onboard oil life monitors, 13,000 miles is not too long. GM engineers have stated that the average number of miles GM cars with the oil life monitors have been covering before the light to change the oil comes on is about 10,000 miles, and this is on dino oil. Add synthetic and you can easily boost that to over 20,000 miles.