Check Engine Light

I have a 99 Silverado with the 5.3L. I've been running about a month with the message center light that says "change engine oil." The other day, my
check engine light came on so I was thinking I'd better get to autozone to have the code read. I wasn't in much of a hurry cause I was thinking one of the O2's finally gave up with 155k miles. Well, I got the oil changed and when I reset the message center light, my check engine light cleared. So, does this model truck let you run with a certain number of key cycles and then set a code? I really didn't think that the check engine light had anything to do with changing the oil, but it just had to be.
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wrote:

No the check engine light does not have anything to do with the change oil. Some codes will clear the light after so many crank cycles without a failure.
Alan
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