Bosch 9605 Double Iridium Spark Plug, Up to 4X Longer Life (Pack of 1)

The Bosch #9605 is a DOUBLE IRIDIUM design, which uses an Iridium coating on BOTH electrodes. Another Amazon customer recommended installing Iridium spark plugs in my V-8 engine, so I did a ton of research on the subject in order to get the best plugs for the least money -- and here's what I found out: The Bosch plug is the only DOUBLE-IRIDIUM design that's currently available -- and the only plug that has both of the Iridium-tipped electrodes laser-welded to the plug . What the illustration doesn't show is that both the center electrode and the ground electrode have iridium surfaces --, which should translate to a superior plug with even longer life than other brands of iridium spark plugs. The Bosch 9605 comes pre-gapped at 1.3 mm (.052) and does not require re-gapping for most applications. Most factory-gapped plugs are famously inaccurate, but a double-check showed the 9605s to be spot-on in every case. These plugs are marked * Made in Germany * on the box, with the proper gap and tightening torque, also. There is NO anti-seize necessary, as the plug is plated to avoid corrosion while allowing proper torque readings. Use of PermaTex Item # 22058 Dielectric Tune-Up Grease (available from Amazon) on the inside of the plug boots prevents boot damage and stops high-voltage terminal corrosion. Use a thin film of dielectric grease on battery posts and terminals to stop corrosion and loss of battery voltage to the electrical system. UPDATE: May 22, 2020 -- After 40,000 miles of use, the Iridium plugs are still providing excellent performance and fuel mileage. Engine starts instantly, idles smoothly, and runs strong.

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I use these in my ford ranger V6 3.0 . They give noticeable increase in power. The engine sounds like it is solid and has more pickup when changing gears or driving at high speeds. They do the trick. Gas mileage is ok and i use non-ethanol gas since it gives me better mpg. Its a rebuilt 95 and purrs down the expressway. Im lucky to have a great mechanic who works for himself and i can depend on when things go bump in the night or day.

I purchased 8 of these and received 3 made in Germany and 5 made in China even though it clearly states that the origin is Germany. Ironically I had a loose porcelain on one that was made in Germany. We shall see how well these work and update if need be.

Very nice spark plugs price was reasonable