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I have to agree with those who say, just keep using whatever oil is working for you. In my case, a VW TDI that has had Mobil 1 5w40 or Mobil Delvac 1 5w40 since the first oil change when the car was new, is still running fine after 602,000 miles. I am not going to switch to a cheaper conventional or blended oil now, when the engine could conceivably run for another 600k miles. And since I have no idea how long the rest of the car will last, I'm going to just assume that it will last as long as I want it to.
I use Mobil 1 high mileage in a couple of my cars and it is synthetic.
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