M104.990 was the 1992-93 300SE engine, LH-SFI fuel system..

M104.980/981 was CIS-E & was the 1990-92 300CE & 1990-93 300SL powerplant.

ALL M104 engines are 24V & have variable intake cam timing.

__________________
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)
Retired Moderator