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Because its thinner and leaks more than conventional. I just want to know a good non synthetic oil to put in my LT1.
This misconception probably stems from the fact that synthetic doesn't sludge. Conventional oils will eventually sludge, so in a way, the leaks get sealed off with sludge to some degree. That's why synthetics leak more, cuz they don't sludge. They'll just keep on leaking.