Review on Denso 3478 Spark Plug by Robert Pierce
Easy to remove and install - an anti-seize agent is recommended prior to installation.
These replace the factory installed spark plugs on the 2012 Sonata 2.4L SE - the factory spark plugs were actually Denso! Easy to remove and install - it is recommended that an anti-seize compound be used prior to installation into the engine block, although you will not need it with a 6" or 10" extension on the spark plug boot. Just start twisting slowly and you'll know right away if you've crossed the strings. If you feel resistance, give up and start over. I just installed them so will have to see if mileage and fuel economy improve as the old ones had a dark ring of char around the base of the ceramic.
- Heavy Duty Construction
- Non Automatic
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