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If you are asking for BRAND, almost anything available is usable. Conventional oils will vary on life between changes (cheap oil=shorter interval). Synthetic oils can be used longer (like 15000 miles for AmsOil). I change at 5000 per Ford specs using Motorcraft or Rotella 15W40 conventional in a '99 7.3l diesel.

If you're asking for viscosity it will depend on your engine, climate, and driving habits.

Next time you're in the parts store grab one of the Haynes manuals someone else has already opened and check the chart, check your own manual, or call the dealer.

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Q: What motor oil should I use for a Ford F-250?
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