Hi, Bob:
The Wxxx numbers are chassis codes, as explained at
http://mbspy.bacosys.be/wcodes.htm . MB tends to make the same chassis for 5-15 years. Engine codes are an M number, such as m103.nnn for the mid-late 80s sohc 6 cyl used in several chassis.
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John
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E