Iridium Plugs. Hi Guys. Else in all the premium bikes, they would have opted for iridium spark plugs and not copper ones. Platinum and iridium plugs also last 2 to 3 times longer than copper plugs, so there is less labor and expense involved into replacing spark plugs. Iridium-tipped spark plugs offer better power, more complete combustion that leads to smooth-running engines, and a longer lifespan than copper/nickel plugs. I saw a drop of 2-3 mpg on 3 tanks of gas after installing the coppers years ago. The Bosch 9659 Double Iridium Spark Plug offers a double-iridium firing pin with ground electrode inlay, which provides up to four times as long of a service life compared to copper plugs, The 0.6mm firing pin ensures superior performance and ignitability. If your owner’s manual specifies iridium spark plugs, don’t downgrade to platinum spark plugs, or double platinum spark plugs, or even copper spark plugs. Iridiums are long life spark plugs which work easily upto 100000km. The fact that a set of 19,000 mile old iridium plugs can outperform brand new copper plugs is like, well, like … since Copper is the best conductor you can get in a spark plug, I'd think that they would work better than anything else out there.. sure since they are soft, they wear out much quicker than an iridium plug, but they are easy to change on our cars.. If your owner’s manual specifies iridium spark plugs, don’t downgrade to platinum spark plugs, or double platinum spark plugs, or even copper spark plugs. Both platinum and iridium fine-wire plugs will outperform copper-tipped plugs, but the iridium's ability to withstand high temperatures allows for a thinner plug tip. Many carmakers require iridium spark plugs or iridium/platinum combination spark plugs for (COP) ignition systems. NGK builds two types of iridium spark plugs: OE Iridium and Iridium IX®. To each their own I guess. You need to make sure that the gapping of the spark plugs should be proper no matter which one they are. The fact that a set of 19,000 mile old iridium plugs can outperform brand new copper plugs is like, well, like an old grandmother out sprinting a teenager. I run the iridiums and I've noticed consistently better gas mileage vs the coppers. In the real world, though, you're unlikely to see any measurable change in fuel economy using iridium instead of platinum plugs. All dual precious metal plugs are designed to provide maximum longevity. I also prefer not to change out plugs all the time either. Iridium IX® vs. OE Iridium Spark Plugs. My corolla came factory fitted with Denso IK16 iridiums they easily lasted hundred thousand kms after that i put in regular copper nickel denso K16 and they worked nicely till 20000-25000kms. Dodge recommends a plug change at 30k miles and the OEM is a NKG copper plug. as suspected, you were running the wrong plugs: the denso's and the autolites are both incorrect for the m103. Just passing on some experience with my recent use of the iridium spark plug. Platinum vs. Iridium? Needless to say that was part of my reasoning. Though the tip is much finer than what you get in a copper or platinum spark plug, the spark from the iridium plug will burn just as effectively. Its better suited in cars where spark plug access is not easy. Many carmakers require iridium spark plugs or iridium/platinum combination spark plugs for (COP) ignition systems. This can be an advantage in certain situations. Depending on application, iridium plugs can even approach the lifespan of some platinum ones. I've replaced my spark plug with the standard copper-type over a year ago and have been cleaning it and adjusting the gap to spec to keep it in best performance, etc. They won’t perform as well as the iridium spark plugs in this case. Every plug in the Laser Series was designed for an OEM application. The more superior types of spark plugs feature platinum and iridium electrodes and are two to three times more durable than the outdated copper spark plug. since Copper is the best conductor you can get in a spark plug, I'd think that they would work better than anything else out there.. sure since they are soft, they wear out much quicker than an iridium plug, but they are easy to change on our cars.. The reason being the positioning and gap of the spark plugs is not proper. time will tell what lasting damage you may incur running resistor plugs. My Axiom uses a waste spark system, so I will replace my current plugs with the OEM Denso PK16PR11 Double platinum plugs, since WSS is very sensitive to the plug type. Is is better t stick with the OEM copper plugs in my 2010 Dodge Ram 1500 (5.7 V8) or go with a platinum or possibly iridium plug? Keep in mind that copper spark plugs need to be changed every 20,000 miles. Then some complain that the engines run too hot. Spark plugs: Copper vs. If you would like a slight reduction in hp and have $18 that you want to get rid of, then by all means, pitch the iridiums and get some copper plugs.