Every major diesel engine manufacturer I know of have an oil change interval recomendation, and a "severe duty" oil change recomendation, which is always shorter. I would classify my engine as severe duty since I run the crap out of it, and the fuel is turned up so soot contamination levels are higher than a stock tuned engine. I change mine every 5k miles, though I would push it farther if it was just a stock driver. I don't see how a shorter interval is going to increase engine wear... It will increase wear on your pocket book though I agree with that! I would also be interested to know how metal contamination in the oil is going to decrease over time from a higher point at the begining, as the engine is running and adding more wear particles to the oil. That is unless the filter is filtering it out, but then why would it be higher in the first place, when the fresh oil would have zero contamination?
Jason
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