Starting in 1986 all MB gas engines in the USA required 91 octane EXCEPT the 190E 2.3 8 valve! 1987 on ALL MB gas engines in the USA require 91 octane.

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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