Normally NGK's & N/DENSOs are more suited for the asian cars they were designed for, however BMW uses NGK plugs as OE. Some of the best plugs made (for MB's)are Beru & Bosch, both of them offer multi-electrode plugs for Benzes. Stay away from platimun plugs unless the car is less than 4 YR old.
MERCEDES BENZ MASTER GUILD TECHNICIAN (6 TIMES)
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. Shopforeman
190E 2.3 ITS RACECAR
1986 190E 16V