OK, I just ordered some hotter plugs from Fast Lane (NGK BP5ES). I'll let everyone know if they run better/longer. This car runs GREAT when the plugs are clean...

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Bill Streep
San Antonio
'57 190SL (toy)
'08 S5500 (mine)
'09 CLK550 (wife's)
'06 SLK350 (daughter's)
'11 GLK350 (daughter's)
'03 CLK310 (spare)