Review on ⚡️ Upgrade Your Engine Performance with 4 New DENSO Iridium IK16 Spark Plugs # 5303 by Joseph Swanson

I have never tested these puppies on my 4 cylinder engine after 35,000 miles. 1 of 4 was fouled due to a corroded spark plug wire causing a cylinder to misfire and clogged the engine. I only make connectors of the same age so you know what happened to the other four Iridium connectors after one of them got dirty (now I invest more money in good connector cables as well because what a waste of $8 on connectors after 35,000 miles). Don't know if these plugs will last the full 100,000km. Definitely tried, I bet they will last a lot longer apart from the rusty one, the other 3 have been looking fine since the day I almost threw them in the engine. The other 3 looked like they were in a cylinder exploding gasoline BUT THESE 3 DO NOT NEED TO CLEAN OR REPLACE THE GAP. I gave these 4 stars because I don't know if I would have liked them. I feel like I would really appreciate it if they put at least 50,000 miles on them otherwise I would just buy platinum plugs. But that was due to riding conditions, weather and my low budget cables; It's my fault the plug wires ruined this savings story. At the very least, make sure the connector wires are triple checked at both ends for a tight fit. great spark plugs, should work as advertised. if you don't skimp on your cable plug.