Originally Posted By: dparm
Denso Iridium are the best you can get, IMO. They have the sharpest tip on the market at just 0.4mm. NGK and Bosch don't have anything that tiny.
Only downside to the tip being that small is that they warn you to replace every 30k. I've run them in my old S4 and now my new one.
IF it weren't a climbing Everest type of endeavor to change the plugs in my car, I would also use these.
But since I need to MAXIMIZE the plug change interval (to save my arms, hands, and MIND), I use the thicker center electroded NGK Laser Iridiums (or the same plug just re-branded AC Delco Iridium).