Factors affecting replacement frequency:
* Engine type: Different engines have different recommended intervals.
* Spark plug type: Platinum or iridium spark plugs generally last longer than standard copper core plugs.
* Driving conditions: Severe driving conditions (frequent stop-and-go traffic, towing) can shorten the lifespan of spark plugs.
* Fuel quality: Using lower-quality fuel can also impact spark plug longevity.
Signs you need new spark plugs:
Before reaching the mileage interval, watch for these symptoms:
* Misfires: Engine roughness, hesitation, or stumbling. This is a major indicator.
* Reduced fuel economy: Noticeably lower gas mileage.
* Hard starting: Difficulty starting the engine.
* Rough idling: The engine shakes or vibrates excessively at idle.
* Check engine light: The illuminated check engine light may indicate a misfire, often caused by faulty spark plugs.
Recommendation: Consult your owner's manual for the specific recommendation for your 2007 Dodge Charger's engine. If you're unsure, a mechanic can inspect your spark plugs and advise on their condition. Don't wait until you experience major problems; replacing them proactively is often cheaper and safer.
