The engine type for the 2.5 16V is 102.990
The biggest difference(other than 2.5 liter) is that engine had a DOUBLE row timing chain.
Valve cover & head will interchange. The EURO 2.5 motors had different cams from the USA cars. about 9 deg more duration.
The cam gears are different!
The EVO motor is a 102.991 engine. NO parts from this engine will interchange with the USA engines
MERCEDES Benz Master Guild Technician (6 TIMES)
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)