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 Bosch W9DC spark plug  alternative? Can someone suggest replacement for hard to find  Bosch w9dc spark plusgs for my 77  450 sl? closest is W9DC O. Is this a good replacement and what does O stand for? Any help appreciated. Abe G | 
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 Ngk -bp5es | 
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 Answer: | 
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 Quote: 
 John Roncallo | 
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 I have a small supply of the Bosch Super W8DC plugs. - Steve | 
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 solution to Bosch spark plug problem Thanks to the experts like Arthur Dalton, W. Hunter and john, problem solved! ( I dont know what us amutaurs  would do without them) Thanks again, bought some nkg bp5es and improvement right away!  Bosh doesnt show any of the W series on their website, although the dealer does have the O WD. I have had many excellent suggestions from Tech help on the forum and appreciate same. Regards, Abe G PS My few contributions have consisted mainly of WD 40 use. Hit my 80th birthday last week.!! keep up the good work. | 
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