Moreover, these conditions may combine in endless ways.

Only with the proper Heat Range will spark plugs sustain the perfect combustion process that keeps your engine's top efficiency and functional reliability, thus guaranteeing performance, power, reliability, mileage and low emissions.

But only a few of the most selected and experienced engine tuners know how to select the spark plug with the proper heat range best suited to match these differents conditions, or the specific engine's level of modification, but them reach it only after long hours of expensive and difficult testing by trial and error with differents spark plugs sets of different heat ranges.

Now with the Spark Plug Heat Range DETERMINATOR® you can Tune-Up your vehicle by yourself, tailoring it according with your own specific, individual and particular driving habits, traffic, weather, engine operating conditions, fuel quality and/or high performance modification level (if you made some), by selecting the spark plug with the customized heat range.

This is the only way that guarantees to achieve the peak power, performance, better mileage and the lowest emissions.

You dont´have to take our words. Spark plug manufacturers have never failed to explicitly acknowledge that:

"A hotter spark plug may be better for prolonged idling or city type stop and go traffic".
AC DELCO Sparkplug

"Use spark plugs one or more heat ranges colder when engines are operated at high speeds for long periods of time".
AUTOLITE Sparkplug

"A colder heat range can be necessary when the engine is subjected to heavy loads".
NGK Sparkplug