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    Mobil 1 for new Chevy 5.3 engine?

    I bought a 93 Buick Regal and switched to Mobil 1 at 500 miles. I changed oil anywhere from 3000 to 7000, depending on when I thought about it. At 165,000 I had it analyzed, and it came back perfect. They said I could probably run it about 7500 miles between changes, and just keep doing whatever...
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