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Ran Bosch Copper core for years until they got hard to find.
Switched to Bosch Platinum until the center electrode broke on two of them at once during a -30 Degree start attempt. Been running NGK V groove plugs ever since, awsome idle and easy startup and easily last 30K without cleaning. Also had great luck with them in Turbo applications.
I am considering the use of the unobtainium plugs dipped in Dihydrogen Monoxide, I hear they double the spark energy without even changing the coil or wires! I also heard that they improve gas mileage by UP TO 50MPG
jorrell
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