Quote:
Originally Posted by corpseal
Hello. For what it is worth, several years and about 50,000 miles ago, I installed the Bosch Platinums with the 4 electrodes (do not recall the exact product name). I have suffered no degradation in performance since then, and the idle remains significantly smoother than the previous NGKs. I believe they were about $5 each at that time.
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I tried the Bosch +4 a cple of yrs ago, and consistently found cracked insulators, sent the plugs back to the Bosch Lab for testing, their reply "must be the engine"
Have used NGK Platinum, and have not experienced any cracked insulators prior to or after the Bosch.
Also tried the Bosch in our Explorers, encountered missfires. They have a waste spark system.
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92 Ford Explorer, 450k
97 Ford Explorer, 360k
99 Tracker, 4dr, 4x4, 2L DOHC, auto 165k
