The computer takes into consideration the # of cold starts, rpm. miles, and # of gallons of fuel burned and a bunch of other sensor readings to give that percentage. Later model engines that have hot thermostats. fuel inj. etc. don't need oil changed at 3000 miles unless they are short-tripped to death and constantly under heavy load. I was a Fleet Service Manager for years and could talk for hours on the subject. I change my gas tractors every 100 hours and I run my 830 CK diesel on 15-40 Amsoil and change it every 3 years. Run my pickup and the wifes car on 5-30 Amsoil and change it once a year, don't even care about the miles. Do some oil sampling, that will tell the story. The boys and I are thinking about converting our trucks to propane, what do you all think of that, any body thought about it??
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