Review on Autolite XP605 4PK Iridium Spark Plug by Michael Lightfoot

After installing these spark plugs in a used Mustang 3.8 I recently bought the difference is like night and day. Definitely more power and better fuel economy. I believe in iridium candles and have used them in my previous car where the dealer recommended iridium candles. While I don't think spark plugs can actually last the 100,000 miles that some claim, these should be the last plugs I need. buy for my mustang. They last longer than standard candles and will not foul unless your engine has other issues that need to be addressed. However, I am satisfied with my purchase and can only recommend it. They cost a little more, but isn't your "baby" worth it?