Date registered: Aug 2008
Vehicle: 2008 E320 Bluetec, 1988 560SL totalled unto death). 1997 Dodge Ram 1500, 1983 300CD
Location: Greater Metropolitan Beaverdam, Virginia
Mentioned: 3 Post(s)
Quoted: 152 Post(s)
I do it
regardless of the advice from some constant posters. Just because the dealers/factory do not recommend it that does not make it harmful. To my knowledge, MB factory does not recommend AGAINST.
From an engineering aspect, it only makes sense to do so. We are threading a steel plug into an aluminum hole. Anticorrosion measures are appropriate. Small differences in apparent torque will matter only to those desperately anal and the possibility of a plug blowout is extremely remote. If a blowout occurs it will be because the threads were previously damaged, probably from not using antseize.
To expand slightly, the notion of leaving a spark plug in place for 100k miles (a period of 10 years for many) is absurd regardless of whether or not the factory says it is o.k. to do so. The cost of removing corroded-in-place plugs and refurbishing the cylinder head at the end of that time will be on the owner's head, not MB's. It is my practice to remove the plugs, inspect for combustion quality, clean, set, clean threads and replace with a new thin coat of neverseize once per year.
Ready to recieve incoming rounds.