Review on Autolite XP5405 Iridium Spark Plug by Ronald Dimatulac

Based on our own experience, installing this spark plug in our automotive engine definitely gave us a noticeable increase in power and fuel efficiency .The iridium construction ensures a longer lifespan than other materials which saves us money in the long run. The only downside was the SLIGHTLY higher cost compared to other spark plugs, but the performance boost is well worth it..