Assertion: engine's displacement | /r/HasProperty | the bmw m20
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text: These included a smaller straight-six in 2.0 and 2.3 L (120 and 140 cu in) displacements (the BMW M20), versions of the larger BMW M30 up to 3.8 L (230 cu in) (the S38B38); and beginning in 1983, a series of M21 straight-six diesel engines.