Interval
OEM time/miles or oil-life monitor — whichever the book says. Severe service if short trips.
Owner's book · not a shop
Know the car. Then the window. Factory specs in plain English — don't authorize until you can say this at the counter.
Fleet
Beginner · short stepsExpert · spec · code · mm
Stamp the book, not the pitch. Ask for millimeters.
OEM interval vs MPI adjectives. Authorization by spec, not menu.
11 · Fleet / shop manager
Interval
OEM time/miles or oil-life monitor — whichever the book says. Severe service if short trips.
Common upsell
Flush, induction, 'high-mileage package,' cabin filter bundled without a look.
Ask for
Viscosity and spec. Monitor reset. Decline the menu unless they show the old cabin filter.
Show me the measurement or the interval page. Then I stamp it.