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I love Mobil1. Thats all I ever use but I have been thinking about switching to Royal Purple but its more expensive. If you use Mobil1 all the time the engine will last forever as long as you dont break anything...
mobil 1 after 3k miles looks as clean as it did on day 1, but then again, so does motorcraft full syn.
not to say all synthetics are equal, but purp, mobil1 and motorcraft syn will all do the same thing, maybe more important that u grab a motorcraft filter.