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Old 11-03-2007, 02:49 PM
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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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Old 11-03-2007, 02:57 PM
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Ngk -bp5es
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Old 11-04-2007, 04:04 PM
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Answer:

Item Number: 0031591003
Main Category: MERCEDES BENZ
Sub Category:
Description: W9DCO, BOSCH, these are "NOT" resistor spark plugs










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Old 11-04-2007, 06:16 PM
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Quote:
Originally Posted by abe g View Post
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
The "O" stands for a larger diameter electrode. If you go to the dealer and order plugs for you car the W9DCO is what you will get.

John Roncallo
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Old 11-04-2007, 07:18 PM
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I have a small supply of the Bosch Super W8DC plugs.

- Steve
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Old 11-05-2007, 03:59 PM
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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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