Despite its reputation for building sporty saloons, BMW has actually been trying to save fuel for a long time. In the 1980s, it built a diesel 3 Series, the 324d, and it even put together a deliberately economical 5 Series. This took the 2.5-litre ‘small six’ petrol engine that was BMW’s hallmark and replaced it with a different crankshaft to lengthen the stroke.
The aim of this move, which increased the car’s capacity...
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