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  • tomxx72002
    Jan 19, 2006
      I purchased a 1988 535is last month and when I checked the plugs I had
      AC Delco R42XLS installed in the motor. The owner manual says Bosch
      WR9LS but I have been told NGK ZGR5A work well. I believe they are
      cheaper and easy to obtain. Has anyone had experience using the NGK's?
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