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-   -   What sparkplug for 89 300se (http://www.peachparts.com/shopforum/showthread.php?t=71401)

mac5725 07-30-2003 08:51 AM

What sparkplug for 89 300se
 
Have found Bosch RD 971's in car. Wrong plug or replacement to ones listed in owners manual?

1991300SEL 07-30-2003 10:32 AM

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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