I have a 300D and have been using Shell RotellaT. It is an oil that comes recommended for diesel engines over in the diesel forum (and in my father-in-laws living room
). In reviewing the owner's manual for my new 90 300E (that I just purchased 2 weeks ago) it has a table that shows 15W40 as an acceptable oil for the car. So I say what the heck why not use RotellaT in my gasoline 300E engine too. The jug states thats its ok to use in gasoline or diesel enginees. Call me crazy?