Review on Pack of 4 Autolite 104-4PK Copper Resistor Spark Plugs by Chad Moser
Autolite 104 copper core spark plug
If you don't mind changing the spark plugs every 18 months which is definitely not a problem for me. These plugs give my wife an extra 1-2 miles per gallon of gas. Her car is a 2005 Mazda 6 with a 2.3 liter 4 cylinder engine with 160 hp. Currently more than 120,000 km run. You can buy iridium spark plugs that last 80,000 to 100,000 miles, but you lose gas miles. in my opinion.
- Resistance reduces radio frequency interference (RFI) and electrode erosion
- Doubt
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