Long ago the Air Force did a study between synthetic and crude based motor oil. The idea, of course, would the AF save money if the fleet ran synthetic. One finding was that synthetic acted as a super detergent oil and there was a significant risk that sludge developed over many miles of non-synthetic would break loose, clog a passage, and fry a motor. What's the current thinking?
As part of that study or maybe separately, they found no difference in performance of oil based on virgin feedstock vs. from reclaimed feedstock.
I started a motor off a little early on Mobil 1 and that sucker always used oil.Given the AF super deterfent theory I think I should've left more miles for break-in.
(At the time synthetic was expensive and I think it came down to a coin flip between that and reclaimed motor oil on the more frequent change schedule.)
