M42 is a 1.8liter engine (with OBD1) and M44 is post 1996 318i with a 1.9liter engine (with OBD2). BMW made a 1.9 liter engine in 1996-1998 to match HP of older version with the new OBD2 requirement. Most parts are the same on the car but always be sure to ask for the correct engine type when you buy parts.
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