Guest Tony_K Posted November 10, 2004 Report Share Posted November 10, 2004 A supplier once told me that with Bosch plugs, the heat range goes down when the heat range number goes up. Is this true, or is it the other way around. I know that with most brands of spark plugs, the higher number will be a hotter range, but one of the brands goes the other way. Is it Bosch? In other words, which is hotter: WR7DS or WR8DS? Thanks, Tony Quote Link to comment Share on other sites More sharing options...
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