This is your 300E 2.6 (or 260E), so I am unsure why you are posting this in the Diesel Forum.
Your engine number is a 103.940, I am unsure right now where the entire engine number is on a 103, but I think it's either on the top of the block directly behind the cylinder head, or on the drivers side of the block near the motor mount bracket.
An easier way is to look in your owners manual packet and find the warranty book. In the back of this book, just inside the back cover is a blue on white sheet which says I believe "Warrtungsheft" on the top, this has the whole engine serial number on it, just look it over, you'll find it, it's the number that starts with "103940"
Last edited by Gilly; 08-18-2002 at 05:22 PM.