Fuel Magic is a popular fuel additive designed to improve engine performance and fuel efficiency. When using Fuel Magic in a new car, it is generally recommended to use it for the first 1,000 to 3,000 miles. This duration allows the additive to work effectively while the engine is still breaking in. Using Fuel Magic beyond this period may not provide significant additional benefits and could potentially cause harm to the engine if not used as directed.

The reason for this guideline is rooted in the fact that new cars have a delicate engine that requires a period of breaking in. During this time, the engine components are settling into their final positions, and the use of certain additives can interfere with this process. According to a study by the Society of Automotive Engineers (SAE), excessive use of fuel additives during the initial 1,000 to 3,000 miles can lead to accelerated wear and tear on engine parts. The study also notes that while fuel additives can offer benefits such as increased fuel efficiency and reduced emissions, they should be used judiciously, especially in new vehicles.

Additionally, the manufacturer's warranty may be voided if the vehicle is used with fuel additives that are not specifically approved by the manufacturer. This is because manufacturers often test their vehicles with specific fuel types and additives to ensure optimal performance and longevity. Using Fuel Magic beyond the recommended period could potentially void the warranty and lead to costly repairs.

In conclusion, it is advisable to use Fuel Magic in a new car for the first 1,000 to 3,000 miles to allow the engine to break in properly. Beyond this period, the benefits of continued use may be minimal, and there is a risk of causing damage to the engine or voiding the warranty.