off road has nothing to do with oil change intervals. Make sure you keep your air filter fresh though.
If you are using a quality synthetic like AMSOIL or MOBIL 1, you can extend intervals to AT LEAST 10,000 miles between oil changes, providing you are using a quality oil filter too. Of course, I highly recommend having oil analysis done also so you really know what is going on inside the engine. Oil change intervals can be extended to 15,000, 20,000 and 25,000 miles providing the performed oil analysis proves that it is OK to do that.
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