[W126 Coupe] Spark Plug Gap

[Bill Reford]

Hi All,

When replacing the timing chain on my 1990 560 (170,000 KM) or (104,000 Miles), I encountered the following:

The existing NGK plugs have an "R" in the part #  (resistor I presume) earlier talk suggested that due the extra resistance that these plugs add to the ignition circuit, they should not be used.

Mercedes Canada cannot get/sell me Bosch W9DCO's, (I believe that these are the proper plugs for my car)

Also the gap ranged from .032 to .055 

What solutions (including proper gap) would the group recommend instead.

Thanks in advance

Bill Reford

1990 560 SEL
1985 500 SEC Euro.
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