Cylinder#1's first plug (closest to the radiator) was oily and smelled bad, too. Some of the OEM plugs were a real bear to break loose, and a handful of them reeked of gasoline even though my car had been sitting for almost 36 hours straight without a start. Averaging 14mpg city/23mpg highway on 89 octane gasoline - which I refuse to compromise on, but splurge and put 91 octane in her once a month or so. patient, kind, and forget I'm riding in a fire breathing dragon who can zip in and out of the mindless hordes clogging the highways and byways of my Midwest college town, I can get 10 days without refilling the gas tank and coast into the gas station on fumes on the 11th day. Yes, yes I know - who cares about gas mileage in our epic muscle cars? I drive ~40 miles round trip highway miles for my daily commute, and if I'm. Supposedly they help improve gas mileage and are good for 120k miles. Why did I choose the Ruthenium's over the Iridium's? I already knew how the factory iridium plugs performed, and I wanted to give the "latest and greatest" from NGK a chance. I splurged and went with the NGK Ruthenium's from Rock Auto and spent a gorgeous Sunday afternoon in my garage installing them. I figured some new spark plugs wouldn't hurt, even if FCA says the stock NGK Iridium's are good for 100k. But, these usually come in heat ranges too cold for an unaltered motor and are usually used in racing applications where all bets are off.Back in April my 2014 100th Anniversary Challenger R/T+ daily driver had 56k miles on the clock. If installed in a regular engine, they would likely last longer than most people keep their car (barring any motor problems that can cause premature plug death). Iridium Racing Plugs Denso iridium racing plugs and some NGK iridium racing plugs have iridium center and a platinum ground electrodes. Under normal operating conditions, expect a good 100k miles out of these plugs. These OEM style plugs typically have special features designed for a specific engine and last 80-120k miles.Īftermarket Long Life Iridium Plugs Autolite Iridium XP, Champion Iridium, Bosch Iridium and Denso Iridium TT bring the features of OEM iridium long life plugs to the market, with an iridium or iridium enhanced fine wire center electrode and platinum or iridium/platinum tipped ground electrode. Bosch Double Iridium includes places iridium in the ground electrode inlay as well. OE Iridium Long Life Plugs NGK Laser Iridium and Denso Long-Life Iridium plugs feature an iridium tipped fine wire center electrode, and platinum tipped ground electrode. Therefore, NGK gives them a life expectancy of 40-50k miles and Denso assigns a recommended replacement interval of 30k miles. Additionally, because gradual wear will "round-off" firing points over time, the concentrated firing power and voltage requirement benefits will be reduced. But plug manufacturers have to temper their projections as driving conditions and motor modifications differ. Typically we have found you can expect 50-80k miles on a traditional iridium plug. The ground electrode will wear out first. Traditional Single Iridium Plugs Denso's Iridium Power and NGK's Iridium IX series have iridium fine-wire center electrodes with tranditional nickel ground electrodes. How Long Will My Iridium Spark Plugs Last?
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