engine specs OM603 147bhp, 195 ftlbs, had a top speed over 125 mph and was the fastest Diesel car in the world, and still rated at 25/30mpg. the '91 300D 2.5LTD had 121hp, 165ftlbs of torque - 0 to 60 in 10.7 seconds, top speed 121mph, 27/33mpg