I'm just posting a story I read some years ago... you draw your own conclusion:
I was getting delivery on a new Lincoln the next week. We ran it on the break in oil long enough to make sure it was broken in, then changed it to this synthetic. After a year, I had put 25,000 miles on it. And incidentally, it was garaged outside throughout the Dearborn winter. Then we pulled down the engine and looked at it. And it was so clean we put it back together, put the same oil back in and ran it for another year. All together, we ran it four years. The filters, I didn't know when to change them, so I changed them every 12,000 miles. It was tuned to factory specs with new points and plugs at 28,000 and 73,000 miles. No other engine work was required. PCV valve at teardown was perfectly clean-it had never been exhanged." Potter showed me the wear data, the engine was carefully measured when it was disassembled. "It was fantastically low. Rings and bearings were within factory tolerance, like new parts. We had never seen that in a 100,000 mile engine before." During the entire period, Potter also had periodic spectrographic oil analyses made. These figures show, of course, very low levels of wear metals, no build up of acidity (Potter used about a quart of oil per thousand miles, so additives were periodically replenished) and the insolubles were low. "People will tell you that you can't run an engine for
I bought a 2000 Vette (other one is a 1990); both are coupes. The 2000 has heads-up display. The "trip" gauge states that oil has 53% life. My question, what is a good rule of thumb to change the oil; i.e. at what % should I change?
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