Date registered: Aug 2002
Vehicle: 2002 SLK 32 AMG, bone stock. 1987 190E 2.3-16 valve (destroyed). 1991 300CE, a work in progress.
Location: Near Washington, DC
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I have to agree with Bazzle on this one.
The problem with the NGK statement is that most people haven't a clue as to what the plating on the spark plugs might be, and that's where the rub lies. Just because a plug has a bright coating doesn't mean that it's the trivalent coating that is applied to the NGK or other plug that you might be installing.
Installing your plugs with a torque wrench is a great idea, but torquing to the lowest numbers isn't always the best idea. You don't always know what you getting when you tighten the item.
The problem with torque wrenches is that many (talking mostly click stop style here) will go off of calibration if mishandled or dropped. They need to be recalibrated on a periodic basis in order to insure that they are giving you what you ask for. How many people do you know that have EVER had their torque wrench calibrated? (No smart ass remarks here thank you.)
Adding a very small amount of anti seize to the threads or even grease does some things as you install spark plugs.
1- Give you a standard for torque, because there will always be some oil, grease, or something on the head threads that will give you an erratic torque or tightness, even though the applied torque might be exactly the same on all plugs.
2- The bond between aluminum and steel can destroy plug hole threads which will require fairly expensive repairs to be made. In many cases the plug threads have already been upgraded with other than just threaded aluminum.
3- Be very sparing with anti-seize, and ONLY on the threads, itâ€™s a conductor of electricity, and will foul a plug in a heartbeatâ€¦.
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