EasyRider300M wrote: I now use NGK platinum plugs on my 00 M that came on the Specials and have about 20k on them. My mpg is the best ever ---not sure if it's the plugs but obviously the plugs are doing their job.
That! i use that too.
I came to the conclusion that unless your engine is highly modified and there is a reason to change the OEM plug, you will waste money for no demonstrable improvement.
I also came to the conclusion that for certain part, better stick to OEM rather than trying save money or face the risk of making certain things worst. Plugs are one of those things. Oil filters another (bad filters may cost your engine as I almost found out several years ago).
NKG plugs have proven to be great to me and there is no reason to change
2002 300M Special Deep Saphire Blue, wing, sunroof - 225K miles - Most Original/Superior Showroom Condition - Carlisle 2015
2003 300M Special Black, wing, sunroof - 118K miles
[strike]2002 300M Pro-Am Graphite, sunroof - 230K miles SOLD[/strike]
[strike]2003 300M Special Black, no sunroof - 88K miles (RIP - Rear hit on daughter 2)[/strike]
[strike]2002 300M Special Black - 200K miles(RIP - rolled over by daughter 2)[/strike]
[strike]2000 Concorde Lxi Forest Green - 200K+ miles (RIP - crashed by daughter 1)[/strike]