There are 4 versions of the 318 motor.
early 80's E30 318 - M10 motor, 1.5L 4cyl
late 80's E30 318 - M42 OBD1 1.8L with different higher flowing intake manifold
early 90's E36 318 - M42 OBD1 1.8L pretty much same as E30 318 motor, but has a worse flowing cast aluminum manifold.
late 90's E36 318 - M44 OBD2 1.9L slightly more torque.
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