Spark plugs should be replace every 30,000 / 35,000 miles or every inspection II. Use the manufactured recommendation for a 1989 325i use Bosch W8LCR. Other spark plug used is the Bosch platinum plus 4 spark plug.
Yep, I checked and 30-35k is the proper range with one exception that I found. They say that the plugs in the 91 318is are approved for up to 100k....wow! Maybe that is why I got 75k out of my last set in the little jewel.
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