yeah even if it CAN last that long, their engine guarantee keeps the oil at the point where it doesnt even need changed. But i figure if i happen to throw a piston or get a ****ed up valve it's on them since they warrant anything the oil touches unless it fails because of something else, but 302s are known for reliability even on dirt cheap conventional oil so 300k on full synth starting at 39k miles with 3k intervals should last me a while. I already know the truck will rust away before the powertrain goes though