Which service has a cost of 7.99?

Fuel System Cleaner is the service that has a cost of 7.99. Typically, a fuel system cleaner is designed to remove deposits from the fuel injectors and intake valves, leading to improved engine performance, better fuel efficiency, and reduced emissions. The price point of 7.99 makes it an affordable option for customers looking to maintain or enhance their vehicle's fuel system without committing to a more expensive service.

In contrast, the other services listed generally involve higher costs due to the complexity of the service or the materials required. For instance, a conventional oil change typically includes the oil, filter, and labor, which collectively add up to more than the cost of the fuel system cleaner. Brake inspections often come with associated labor costs and may require additional parts if any issues are found, thus raising the overall price as well. Windshield washer fluid, while it can have a low cost, is generally provided as part of a more comprehensive service or maintenance check, not at a standalone low price like the fuel system cleaner.