Quote:
Originally Posted by abe g
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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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