something like 500 hits on the question - " where do i look to find the engine number"? car in question is an 89 300e. need the number to choose between the two temperature sensors identified for this model year. thank you.

Try calling a dealer with your VIN#

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1CL0O6GWD1D40QWEK2&year=1989&make=MB&model=300-E-002&category=R&part=A%2FC+ACC+Temp+Sensor&appEngines=_any

__________________
-Marty

1986 300E 220,000 miles+ transmission impossible
(Now waiting under a bridge in order to become one)

Reading your M103 duty cycle:
http://www.peachparts.com/shopforum/831799-post13.html
http://www.peachparts.com/shopforum/831807-post14.html

On the last page of the maintenance booklet there may be a vehicle data card which lists information such as Chassis No, Engine No, Transmission, ...