Replaced old plugs, DENSO W20EXR-U, with new NGK BPR6ES. Idles a lot more smoothly now.
I prefer NGK for both plugs and wires.
Just wanted to let you know i done the change and it was the easiest one i have ever done in my life! I went with the NGK Laser Platinum PZFR5Q-11 , but wanted to let you know just in case it could keep some out there from not checking the gap on these plugs prior to install. I thought they were supposed to come pre-gaped, but every one of them were set @ .040, instead of the manufacture recommended .044. Anyway, glad I checked, and thanks for the reply!
I use cheap-o copper NGK V-Power all copper plugs on my M Roadster that produce max power (according to a cohort of enthusiast whack-jobs who repeatedly dyno their cars to look for .0005% differences in power output), but need to be changed every year. No problems thus far.
Pretty sure it had original plugs in it, replaced those with some autolites that were on sale, soon to put champion coppers in it though (personal preference).
I use NGK's, and they seem to do just fine.
Oil change every 5-7k miles Mobile 1 European Formula (0w-40) Seafoam every 5-6 months New NGK Laser Platinums Plugs (500mi ago) 1 new coil
I run the DCPR8EIX and they are great. No need for 9's for me.
I had NGK PFR6Q and it ran fine. But... now I use the stock NGK plugs
The NGK's listed have a colder heat range. Great in the summer, it will misfire like crazy in the winter
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