BMW M20

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The BMW M20 is a SOHC straight-six petrol engine which was produced from 1977 to 1993. The first BMW models to use the M20 were the E12 5 Series and the E21 3 Series. It was introduced eight years after the larger BMW M30 straight-six engine which remained in production alongside the M20. Due to their time being produced simultaneously, the smaller-displacement M20 was affectionately named the 'Little Six'; while the larger-displacement M30 garnered the names 'Big Six' and 'Senior Six'. The M20 laid the groundwork design that all inline-six engines going forward would follow and was also the basis for the BMW M21 diesel engine and its descendants. It is also loosely related to the BMW M70 V12 petrol engine. The M20 began to be phased out following the introduction of the M50 engine in 1990, with the final examples fitted to the E30 3 Series touring and convertible models built in April 1993. Early versions of the M20 were sometimes referred to as the "M60", although the M60 designation...

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