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Old 04-04-2002, 08:39 PM
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Gilly Gilly is offline
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Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
The "O" or 0 at the end indicates a heavy duty center electrode per the Bosch catalog. Our shop uses the "O' or 0 suffix sparkplug instead of the non-O or 0 sparkplugs with good results. MB started recommending this plug beginning August of 88 for vehicles beginning at that date, we went ahead and made it retroactive to include the previous engines as well. The plug is otherwise identical, so why not have the heavy duty electrode?
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