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Old 07-30-2003, 09:51 AM
mac5725
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What sparkplug for 89 300se

Have found Bosch RD 971's in car. Wrong plug or replacement to ones listed in owners manual?
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Old 07-30-2003, 11:32 AM
1991300SEL's Avatar
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Join Date: May 2003
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BOSCH H9DC0

Manual calls for a gap of what amts. to .032

Many claim they get a smoother idle going higher - some as high as .040. I set mine at .036.

There is also an H9DC, but it's electrode is not quite as wide as the H9DCO. I've used both and cannot see a performance difference.
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