Quote:
Originally posted by Duke2.6
In the Bosch heat range system the higher the number the hotter the plug, so 9 is hotter than 8.
The "0" suffix has a larger electrodes. Theoetically they should have longer life, but the standard electrode version has no problem lasting 30K miles. Given the additional price of the "0" suffix plug, I don't think they are worth the additional cost.
Also, I believe that the larger electrodes contribute to idle misfire, which can cause emission problems and is the likely source of the slight idle roughness that is typical of 103 engines. Since the electodes are relatively cold compared to incipient flame front temperature, they will have more tendency to quench the incipient flame and cause a misfire.
Duke
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So are you saying that the "0" version may cause slight idle roughness?