Dean… I'm thinking you are correct with your assessment of the oil filter housing check valve. It would make one suspect with the problem I’m describing. Even though I changed the oil filter valve this past weekend, I'm considering going to the dealer tomorrow and purchasing a new MB brand valve and change the part again. My “off” brand unit might not be keeping a good seal.
Does anyone know how I might check the current valve without removing the oil filter housing and replacing the part? Shouldn’t the oil filter housing keep oil in the unit without draining back into the engine when I remove the oil filter?
I'll also going to remove the oil slump pan and check for any timing guide remains.
Gosh… I’m getting good at removing parts from the front of the engine since I’m performing this job practically every weekend now! Geeze!
Dean...let me know if you need any tips on changing the oil filter housing!