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For years a normal oil change in my race car also meant the same oil went into the tow vehicle.We only used regular oil but changed it maybe 50 passes in a 12 second stocker.

You use 200 miles as the factor in determining the overall amount it was used. In something like a fire engine how many HOURS was it been used would be more relative to it's condition.



Exactly Fred, 200 miles and 200 hours at idle. There is nothing that pollutes oil in a diesel worse than sooting it up idling. I'd look into that for sure.

Also as someone else mentioned some OTR truckers will run their oil up to 100k miles, but they're also using a bypass filter system as well as the OE filters.

'65 Belvedere
'68 GTX
'57 Dodge pickup