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i switched at 60000 on my '00 5.4 to mobile one syn 5-20 no leaks doesnt use any oil. i change at 6k with a motorcraft filter every 3k. ( takes about half a quart after filter change.
Thanks for the replies. I like the Idea of a full syn. oil but with the miles I was worried about leaking. I have seen Motorcycles leek very badly when people have tried to switch after many miles. Scotty