The 'Big Six'
The 3.0 litre ‘big six’ was produced from 1951 until 1967 with no change in its 2,996 cc displacement derived from a slightly under-square 85 mm x 88mm bore and stroke. The various versions of the engine (M186 – M198) produced from 113 – 212 bhp (158 kW) as compression ratios rose and the number of carburettors multiplied or were replaced with fuel-injection. These engines powered the 300 Adenauer, 300S/Sc, 300SL, 300SE Fintail/Coupe/Cabrio (W111/112), 300SE/SEL (W108/109).2
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