NGK BKR5EIX-11 Iridium IX Spark Plug

 (33 customer reviews)

My Honda Foreman 500 used to be very cold natured until I put this plug in. It now doesn't need to be started by choking much of the time and when I do have to choke the engine, it can be unchoked after starting where I used to run with choke for a while before it would stay running. Great plug.

I noticed people are buying Permatex anti-seize along with these NGK iridium plugs. According to the NGK website, anti-seize lubricant should not be applied to the threads, since they have a special plating that resists seizing without the use of compounds. Also, the threads should be dry during installation, since use of anti seize can cause an increase in the torque applied, thereby creating the possibility of over-tightening.

I have four of these plugs in my 2002 Corolla with stock ignition and they are Fantastic! I just checked them after 11,636 miles and there is no electrode erosion on these plugs (Checked plugs with a wire gap tool)! I would suggest to everybody who changes their own spark plugs to at least check them around every 12,000 miles or once a year (even if they are long life plugs, reading the plug will let you know about any potential issues with the engine). If your looking to put better plugs in your Corolla, NGK Iridium IX is an excellent choice. Fuel economy on the Corolla does slightly increase ~1% but every little bit counts! Another pointer is to drive conservatively and (if you can) anticipate traffic flow, curves, hills and don't ride the brakes - increase your following distance and let the car coast down the road. God Bless and happy trails!