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Some years back, Splitfire joined the questionable "club" of auto parts and snake oil hawkers who got into trouble with the Fed Trade Commission for claims they couldn't back up. Like Slick-50, and those magnetic gadgets ("Ionizers" ?!) that "up to double your mileage"...etc. they paid a fine and agreed to stop making claims which they were unable to prove. When I see this, I stay far, far away from the product, as the makers are (IMHO) proven sleazes. The B21/23/230 engines are pretty mild and will tolerate any half-decent plug. I've found NGK's to last better than Bosch or Champion, so that's what I've used for many years and many Volvos.
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Bob (81-244GL B21F, 83-244DL B23F, 94-940Sedan B230F)
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