Review on Bosch Automotive OE 9600 Fine Wire Double Iridium Spark Plug - Single by Alexander Roberson

I researched these spark plugs fairly thoroughly before purchasing them. I recommend this brand and this fork. The plugs I received were exactly what I ordered. They fit perfectly on my high mileage 2006 Hyundai Tucson. They were correctly pre-sealed and all four stoppers in my package had the same gap (good quality control). No problem. I immediately started saving fuel. About 15%-20%. It's not a lot in dollars and cents but to me it shows they are better than my old worn out plugs. In the picture I've attached you can see my old candles and the new ones. The old ones are a different brand but more importantly they are single layer iridium. I think old spark plugs are around 40-60k miles. This means that only one of the two electrodes is made of resistant iridium. The other electrode on the connector could be copper, I don't know. But you can see that the old spark plugs are worn out and the bottom electrode is almost worn out. The new candles, Bosch-9600, have an iridium coating on both electrodes, which makes the arcing surface of the electrode very durable. I expect them to last over 60,000km. What could be more than my car lasts. Much luck.