I have been working with engines, both gas and diesel, for almost 20 years, including complete rebuilds/overhauls, and everything from lawn mowers, to my current role in generator sets from 25KW to 4000KW.
I have always followed the practice of checking engine oil after sitting overnight, or at the very least, waiting several minutes after running a hot engine and shutting down. (to allow time for the oil to run back down into the pan)
While at the dealership yesterday, for my oil consumption test review, they topped me off "to the full mark" I was told, and said to come back in 1200 miles so they could gauge my consumption.
I went out to my car in the parking lot and popped the hood and checked the level for myself, and it was close to 3/4" to 1" over the full mark.
After going back into the service dept, they said to pull it up to the garage door and they would have the tech verify, so I did. I parked it in front and popped the hood, and waited about 3 minutes for the tech to come over and check it.
ready for this:
instead of checking the dipstick, he walks over to the drivers door and reaches in starts the engine for 5 seconds, and then shuts it off, walks over to the dipstick and checks it a couple times!
I asked HOW and WHY he would expect an accurate reading when all of the oil is up in the engine, and he said that is the "official way to check the oil". The service manager was standing right next to him.
I questioned the tech and the service manager on this in detail, and explained why I didn't think it made any sense, and they didn't change their position on this....
Has anyone heard of this? Can anyone explain this?
As for the oil consumption test, I could certainly drain or pump out the oil to reduce the amount of oil in the engine, right before bringing it in, but that is certainly not my intention. I simply want to ACCURATELY measure my consumption.