One of my friends went 10K on his Mustang with synthetic. He only had one quart left when he finally changed/added oil, but his engine was fine. Mobile 1 now guarantees the oil to 15K or one year, though I wouldn't recommend keeping it that long. Mechanics have told me that you can get double the life from synthetic, probably around 5-6K if you wanted to.
best oil for engine
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Is it THAT much trouble to just change your oil every 2-3 months though? Using synthetic seems pretty pointless to me...
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Dino oil sucks for the main reason that I do not always have the time to change my oil every 3-4 weeks, or will the weather permit me to. I have run about 10,000 mile runs on Amsoil 5w-30 and filters and in the last two runs, I have not lost a single drop of oil.
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