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      01-08-2013, 04:51 PM   #20
Pete C
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Drives: '08 Z4 SI
Join Date: Nov 2012
Location: Colorado

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@angelsz4,
With your single ground sparkplug the gap is adjustable and 0.032 inches is probable the manufacturer's recommendation for your engine. Sparkplug manufactures base their recommendations after extensive testing so even if it's not OEM it works fine. I like the single ground myself but can't claim any more power or fuel economy.

Another tightening option is to follow the sometimes included packaging info that shows tightening 1/4 to 1/2 turn beyond finger tight. This works fine for NEW plugs but ONLY before the gasket gets compressed. If I decide to reuse a sparkplug then always with a torque wrench as posted above.

Last edited by Pete C; 01-08-2013 at 05:31 PM.. Reason: tightening update
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