When I was at the dealers in 05-06 BMW came out with the no dipstick, engine oil quality/quantity sensor, they were failing in the low position. People were putting 3-4 gallons in the cars and blowing the motors. Its extremely annoying when they wont give you a countdown to know how longs left to measure, it just says no information available. At least now theres a little gauge and they raise the idle so you know what the counts at. Also, if the car is cold, Porsche will count down from 60 minutes to do a measurement, so most times we go a splash under. This tech also has never worked on a cartridge, he probably left a half quart of used oil by not unscrewing the filter first.