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The time thing is a marketing ploy.
It's been in the ground for a bazillion years and in the system for maybe 10 years.
Some machinery goes literally forever without an oil change.
Fuel does get past the rings and can dilute, but that's not a time thing.
I believe it's a hanger-on from the 6 months or 3,000 mile hypnosis of the 1950's
Lots of youtube videos to help you decide.
And
3250 miles is four day trip on tractor trailer rigs.
That would be 6+ oil changes per month for a driving team.
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