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Discussion Starter #1
Ok, so you can see from my sig, I been running the cooler NGK IX iridiums
(5691's) but they seem to crap out at around 30K miles.
So I'm looking at the laser iridiums, but they don't come in a cooler
model, just stock.

What the best plug for a Overdriven M111 motor?
I gotta do this ASAP, getting misfires and it's not the coil pack,
and only 30K miles on the plugs!:surrender:
 

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I was going to refer you to the discussion on the R170 forum but I see you've already been there!- seems comprehensive.

Oberoi
 

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Discussion Starter #3
I was going to refer you to the discussion on the R170 forum but I see you've already been there!- seems comprehensive.

Oberoi
Yeah, while not a cooler heat range the plug of choice seems to be the NGK
IFR6D10.
I may have a set laying around from when I originally pulled the stock plugs
to switch to the cooler ones and they only had a few miles.
Otherwise, sheeeet, they're about 60 for a set and no one locally carries them,
Well maybe the dealer, ha.
 
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