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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 03-03-2005, 11:18 PM   #1 (permalink)
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What is bad about the bosch platinum spark plugs? I was just advised not to use them on my 1985 318i in another post, and so I did a search on the forum. Apparently this question was asked before, however it was not answered. Why are they bad? They are supposed to be better, right?

Also, NGK's, are they better than Bosch for BMW's?
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Old 03-03-2005, 11:39 PM   #2 (permalink)
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They arn't bad plugs if the car came with plat plugs. Plat plugs were designed to be used with cars that have a hot ignition spark to keep the plat puck and eletrode clean. Using them in an older car that doesn't have a hot spark like the newer cars do will cause them to foul out and cause a poor running condition. If one of my cars came with plat plugs I would not hesitate to replace them with the Bosch ones when they needed to be replaced but neither of my cars came with them so I don't use them. At the BMW shop I work at I've seen plat plugs cause more running problems in the older cars than they solve. For your car just use the Bosch WR9DC or WR9DS if you use only premium gas.
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