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It is a question concerning the IRIDIUM POWER that is often.
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| In ordinary cars, use a spark plug with the same heat range as a normal spark plug. In highly tuned vehicles, select a heat range to suit the tuning level of the engine. (Ordinarily, the heat range of a highly tuned engine tends to be colder.) |
| Refer to the following table to compare the heat range of the IRIDIUM POWER and other spark plugs. |
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