Average Reviews:
(More customer reviews)Bosch platinum plugs (reg, +2, +4) have worked very well for me in newer cars, not so well in those older than about 1999. They like higher voltage ignition systems. They can misfire with lower voltage. Sometimes larger plug wires fix it, it depends on the overall design of the ignition system.
Despite the hype on the web and anecdotal stories, virtually all spark plug manufacturers recommend against using anti-seize compound when installing plugs. They nickle-plate the threads to protect against seizing. The anti-seize compounds, even copper based, tend to increase the resistance to ground, and to upset the torque required to seat the plugs. The silver based compound will seriously increase resistance causing misfires and serious overheating of the plugs, and I have experienced the plug ceramic tips breaking off and falling into the cylinder. It sounds like a bad valve lifter and can damage the cylinder or valves. Copper based compound is less resistance, but still often too much, and any of it getting to the plug tip causes bad things. But just as big a problem is effect on plug torque.
Torquing the plugs depends greatly on the lubrication resistance of the threads, and the technique. Adding any lube, including anti-seize, reduces friction so that using a torque wrench results in the plug turning farther, stretching the materials as it does, to achieve the recommended torque value. This can cause stripping and fracturing. Unless the manufacturer gives instructions for torquing plugs or bolts using lubricant, they should be done dry with clean threads. That gives proper performance and prevents them from coming loose.
Bottom line: great plugs for the right applications, when installed properly. Don't use anti-seize on plugs, because the manufacturer already accounted for it. And never over-torque them.
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Bosch Platinum Plus spark plug has exclusive platinum technology with yttrium enhanced ground electrode for quicker starts, smoother acceleration and increased fuel efficiency.
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