| I spoke on the phone with an NGK rep. His comments were.....
He used GM as a reference, so take that for what it's worth.
If the "normal" lifespan of standard plugs is between 10K and 30K miles, Platinum plugs can run up to ~ 100K miles, and Iridium plugs will go up to ~ 180K miles. There is no apparent down side to either of these plugs other then cost, and a few benefits including slightly better gas mileage.
If we can run almost 200K miles on a set of plugs, few Mercedes cars will ever need more then 4 sets between overhauls.
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2002 SLK 32,
1987 190E 2.3-16 valve
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