Quote:

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.



Absolutely correct. It's hours not miles on these kinds of vehicles. Idling can be worse than hard use.