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There are as many opinions as #%*#$ in any event NGK plugs and Valvoline straight 50. It does not foam like some of the others, change no more than 25 hours and you will live forever.
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Originally Posted by bsirk
(Post 2086900)
My 502 is not blown. Stock, with EMI Thunder Headers. Bosch Plat. 4+ still a bad idea??
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