Which two factors are primary for determining service intervals?

The two primary factors for determining service intervals are time and mileage. These factors are essential because they provide measurable and straightforward criteria for scheduling maintenance activities.

Time refers to the duration since the last service was performed. Regular time intervals help ensure that vehicles or equipment are maintained before issues arise, especially for components that may degrade or require servicing over time due to environmental conditions or typical wear and tear.

Mileage accounts for the distance a vehicle has traveled since its last service. This is critical for understanding how much the vehicle has been used, as certain components experience wear directly related to the number of miles driven. High mileage may indicate a need for more frequent maintenance to preserve vehicle performance and safety.

Together, time and mileage create a comprehensive framework for maintenance scheduling. This dual approach helps address both the age of the vehicle and its operational demands, ensuring optimal vehicle performance and reliability.