Yeah, but how would you know when that bypass valve went faulty on you? Heck, if I go by mileage, I change the oil on the vettes way, WAY before the 3,000 mile mark. But as for time, well heck, sometimes time just gets away from me. Might seem like just last month that I changed the oil, but in reality a year or more might have passed by.
For instance, I just changed the oil in the C5Z the other day. According to the mileage, just 890 miles had elapsed since the last oil change. But as for the timespan, if I remember correctly from what I saw on my log page in the manual, it was a year and a half ago. Oil still looked very good coming out of the oil pan, and I am using full synthetic Joe Gibbs LS30, which is supposed to be pretty good stuff.
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