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Re: motor oils
My 98 z71 has a tad over 250k miles on the org engine in it. I bought it with 31k 21 years ago. It had Castrol conv 10w30 from new si I kept going with that. Always right on full at 3000 miles. In 2007 I bought a new GMC and let my son drive the 98. He swapped it to Castrol Synthetic 10w30. I got it back at 177k. It drops a qt at 3k and is another qt low at 5000 when I change it. Im not sure it wouldnt do that with conv oil, but we may never know.
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