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Re: Iridium Plugs-Denso IK22 (Randall)

I have found sticking to the stock Volvo plugs works the best. Also you should note, the spark plugs in the R cannot be used in any other engine because of the length of the thread 26.5 mm compared to 19 mm for other Volvo engines. In addition, the Ceramic has been thinned to a point at the bottom to minimize carbon deposits when cold starting.

Doug H
 
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