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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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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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