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Message: [QUOTE="CATDiezel, post: 1403924, member: 4387"] I will freely publish the fact that in our fleet of many 8000+HP engines we run them at 15,000hr intervals between oil changes at times. Government regulations are knocking us back to 8760hr intervals. But I have creeped as much as 20,000hrs on an oil change. (Mind you the sump is 750 gallons of oil) engine is worth roughly $7,000,000 a per engine. I understand this is not mileage but you get the drift.... yes these are natural gas engines that burn much cleaner... but we live by oil sampling. The diesels run very long hour intervals as well as long as they have centrifuge spinners on them. They do very well. I've seen upwards of 10,000hrs before the oil was changed. And no there is no sludge buildup. The engines are large enough to go into the oil pan and take a look around inside. And I mean your body inside the crankcase. [/QUOTE]

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