I know they ain't common but merc build the worst manual gearbox of alomst any car i have tryed i have a 318i with 140,000miles on the clock and it has a far nicer shift than the few manual mercs i have tryed.

As to the autos i have tryed an auto car but i never wanted to as i just like my clutch pedal too much
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P.Allison fixer of big engines Mk2+Mk2a signed by God / Hacked by the Lord Aberdeen Scotland