Cast iron block! Only thing in common with M102 is that they both are 4 cylinder engines.
TO get aluminum block 4 cylinder you must buy a C230K(1.8L) after 2003 with the M271 engine.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)