4 cyl spark plugs on V6??

Discussion in 'Engine' started by allias, Aug 19, 2014.

  1. allias

    allias Active Member

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    It might sound stupid but I wonder if it is suitable to use OE spark plug designated for M111 (A003 159 75 03) for M112 (A004 159 50 03)??

    They are the same gap (1.0mm)and yes they are different part numbers and different engines but what are other facts and figures that make them different? Is it suitable to use them 50 03 on V6?
     
  2. hotrodder

    hotrodder Active Member

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    Spark plugs don't know or care how many cylinders the engine has and the number of earth electrodes is only about service life however there are various other differences that do make a big difference... things like plug thread/reach, heat range, seat type etc etc. These things are in 'code' form in the plug manufacturers # for example http://www.ngksparkplugs.com/techinfo/spark_plugs/partnumberkey.pdf and there are also various cross reference charts so an NGK whatever can be looked up and it'll give the equivilant from Beru, Bosch etc
     
  3. markjay

    markjay MB Club Veteran

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    As hotrodder said, spark plugs have different heat rating, some have a built in resistor, etc.

    The higher number of electrodes extends the service life but does not affect performance

    The best option is to check the spark plug manufacturer's catalogue to see which plugs are suitable for your M112.
     
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