Review on 🔌 Bosch Automotive 7424 OE Double Platinum Spark Plug - Single - Fine Wire Design by Nick Kussmaul

They fit my 2010 e350 3.5L V6 perfectly for some reason! Some motors are designed to very specific tolerances and I've found the hard way that my e350 motor is one of them. I originally bought Denso iridium candles, trading long life for potentially better fuel burn, and all that put a hole in my wallet. After installing the Denso spark plugs, I had noticeable misfires that shook the engine so badly you could feel it on the steering wheel. I've tried everything; Torque testing, reel boot fitting, whatever. Problem?. The threads on the Bosh spark plug are not only slightly longer, which allows the electrode to sit a little lower in the engine block, but are also indexed so that the electrode points in a specific direction in the combustion chamber when screwed in correctly. After playing around with other spark plugs for a few days, I ordered a Bosch and half an hour after delivery my car was purring like a kitten again. From now on I have OEM parts.