Two weeks ago I replaced the little blue check valve referred to in several of the past posts. I purchased it at the local MB dealer which was a pain because they said that they couldn't cross reference part numbers. Finally he found the right part due to numerous part number changes. Anyway after a 2400 mile run to Mobile, Al. then to Fayetteville, NC. and the back to Ind. No mil light problem, possible cured for 23 bucks and 5 minutes time. Oh the light came on one time right after I started it the first time but after a quick reset all was well. I believe that this is the new MB part # A 002 140 84 60. And I was getting about 29 mpg overall running on the interstate 73 -74 mph when speed limit was 70.