Denso's Iridium power spark plugs help your vehicle achieve unparalleled performance. It alters the belief that a mere spark plug can add power and mileage. This is done by combining an ultra-fine 0.4mm diameter Iridium center electrode with a tapered cut
Comment: I have been using iridium since 2001 on my civic. I saw quite a few comment about lifespan of the plug.
My denso iridum on the box said good for 250000 miles, and my civic is at 260000 and still running swell.
So they do last long, unless they reduce the quality so denso can make more $$.
Customer Rating:
Summary: don't hesitate to buy this one 2010-07-11
Comment: If you look for quality, don't hesitate to buy this one.
Frankly, when I fixed it (all pack) I felt that my car's engine worked smoother.
Customer Rating:
Summary: Best spark plugs 2010-06-25
Comment: I tried some slightly lesser iridium ones in the past, but this one beats them all. For both of my cars (a Nissan and a Suzuki) the engines instantly ran/sounded better. The Suzuki ('04) hasn't really shown any improvement in the gas mileage, but the older Nissan ('97) now gets about 2 miles more per gallon.
Customer Rating:
Summary: Good product by Denso 2010-05-04
Comment: I have used those spark plugs in my 2008 Chevy 1.6 L Aveo with 10.000 miles. I have noticed that the engine runs smoother. I haven't made detailed counts but I think that the gas millage doesn't increase significantly, but yes It does
Customer Rating:
Summary: Awesome deal on high quality plugs! 2010-04-27
Comment: I recently bought a set of 6 Denso IK20 Iridium spark plugs for my girlfriends jetta vr6. They were a direct replacement of the oem's and installed smoothly. The car desperately needed a new set and now runs great. Awesome price and free shipping is nice too.
My denso iridum on the box said good for 250000 miles, and my civic is at 260000 and still running swell.
So they do last long, unless they reduce the quality so denso can make more $$.