I've debated when is the best time to check the oil, first thing in the morning or after a few minutes of shutting the engine off. The owner's manual says to check the oil level with the oil being at operating temp. I would think that if the car has been sitting all night, then ALL the oil would be down in the pan, leaving no question as to how much oil is in the engine. I think the best way to monitor the oil level is to check it at the same time, consistently, ie; either stone cold or 10 min. after shut down.
1994 MB E320 Coupe (199,500 mi)
1992 MB 190E 2.6 (173,000 mi)
1983 Porsche 911SC (148,000 mi)
2004 Volvo V70 2.5T (198,000 mi)
President of CT/Westchester Section