1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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17,323 Posts
Not really. The Champion RN-12YC spark plug recommended in the owners manual and underhood emissions label is still the best plug chosen by the Chrysler engineers for your engine under extensive factory laboratory research conditions.
Copper still offers the best burn. Platinums may last 3 times longer, but some applications experience misfire and yours are easy to change anyways. Iridium is overkill, you won't experience any performance benefit.
Beware of spark plug marketing horsepower and fuel economy claims because 99% of that is all it is...marketing.
Good cap,rotor and wires are important.
If the car has sat for 6 years, a bottle of Techron in the fuel tank can't hurt and I would be more concerned about what the inside of the tank, pump, lines and injector look like after that amount of time.
Change the oil, filter, coolant, ATF, P/S and brake fluids as well after sitting that long just to be on the safe side. Fluids do age, even without use.
Copper still offers the best burn. Platinums may last 3 times longer, but some applications experience misfire and yours are easy to change anyways. Iridium is overkill, you won't experience any performance benefit.
Beware of spark plug marketing horsepower and fuel economy claims because 99% of that is all it is...marketing.
Good cap,rotor and wires are important.
If the car has sat for 6 years, a bottle of Techron in the fuel tank can't hurt and I would be more concerned about what the inside of the tank, pump, lines and injector look like after that amount of time.
Change the oil, filter, coolant, ATF, P/S and brake fluids as well after sitting that long just to be on the safe side. Fluids do age, even without use.