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Not true, at least according to the Synthetic manu sires. They do say, however, that it is better to have some miles on the engine prior to changing over to synthetic. I did it to 2 97 GLT Torbo's... No leaks, and (I really think that the turbo spins up faster with syn oil)... Maybe just wishful thinking.. Going to syn in the trannies next.. That's a few $$$ 22 qts of that stuff at $6 per qt... But I did a BG cleaner in them, flushed them with plain old tranny fluid, and at 1k miles going to flush again with syn....
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