In Reply to: Re: NGK plugs posted by Ekkehart Rackete, Bochum Germany on October 13, 2001 at 09:39:24:
If I had to come completely clean on this, I'd have to say that dropping $10+ per plug for what is called a "power plug" smells a little like snake oil to me and is hard to justify. (spark plugs are one of those things that aftermarket suppliers love to scalp owners on... new fangled spark plugs are the epitome of the elusive bolt on horsepower.) The other traditional plugs that are recommended are 25% of that price and I've had 60K miles of trouble free plug performance... hard to justify the "black magic" brand. These number 5156 ZFR5F plugs were not plugs that I had seen before, but as I said, are the plug that NGK is recommending for the 12 cylinder monster.
This is certainly not a plug that BMW recommends.
NKG is since 1-2 years sole source for spark plugs for BMW. But I would be very surprised if BMW recommends anything they IMHO do not use in production. Check archive for the type of NGK 4-electrode plugs BMW recommends for almost all 4-14 cylinder engines. Ekkehart
I have one question: why are so many people experimenting with plugs? Most people don't have the equipment (test stand with brake) nor the knowledge to select a plug different from the manufacturers (car) recommendation. For me a piston with a whole due to a wrong plug woud be a major headache.