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Bad injectors can cause the loop type plugs to burn out. Excessive carbon buildup is another possiblity. There is a special reamer tool for removing the carbon buildup, but it's a bit expensive. In either case, most likely the problem would repeat itself on one cylinder. It doesn't seem likely that all 4 plugs could actually burn out at the same time.
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Palangi
2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg
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