Review on Bosch Automotive (9654) OE Fine Wire Double Iridium Spark Plug - Single: Improved Performance and Exceptional Durability by Jeff Morris
Iridium Parts Upgrade
I installed a set of 16 of these spark plugs on my Chrysler 300C and noticed a noticeable improvement in engine idle. I believe gas mileage has also increased by about 2mpg, but only at highway speeds. I have a slightly heavy foot in the city so my MPG hasn't changed there. These candles are very high quality and can last my car for a lifetime. I highly recommend them.
- Brilliantly Done
- Too Long To Wait
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