The best one that you can afford and change regularly. I have a 1999 Ford Powerstroke with 963,000 miles. I change the oil every 5000 miles, and I use a mineral based oil. If I was using a synthetic, I might be able to stretch it out to about every 7000 miles.
The factory almost certainly recommends synthetic oil. Almost all manufacturers do now.
mobil 1 synthetic 5w-30 or 0w-30 in cold weather.
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