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Originally Posted by ragingbull
Let's consider that tractor trailer trucks don't have regular oil changes shall we? They simply get an oil analysis every so often and those engines last hundreds and hundreds of thousands of miles.
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Well, on highway truck engines all start off with regular oil change intervals, often 12,500 or 15,000 or more miles (my experience is with the yellow ones from Peoria, but other brands are similar). Any variation from those intervals should be done based on a rigorous Scheduled Oil Analysis (SOS) program, or the equivalent program from another manufacturer. That program looks at engine condition, fluid condition, and operating conditions. Any extension of oil change intervals has to be based on that program, it isn't just a case of occasionally getting an SOS sample. That is how we get them to the million mile club. We can see 30,000+ mile change intervals, sure, but the ones who get the best performance out of their heavy duty engines, over the full life cycle, most definitely have a regular oil change; those oil changes just aren't necessarily at the manufacturer's recommended mileage, rather they are condition-based.
As an aside, welcome to the site!  (should we call you Jake?)
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