Determining Scheduled Maintenance Intervals: 00–01

Performing regular maintenance will help ensure that your Western Star vehicle delivers safe, reliable service and optimum performance for years to come. Failure to follow a regular maintenance program can result in inefficient operation and unscheduled downtime.

To determine the correct maintenance intervals for your vehicle, you must first determine the type of service or conditions in which the vehicle will be operating. Generally, most vehicles operate under conditions that fall within one of the two types of service described. Before placing your new vehicle in service, determine the type of service (Service Schedule I or II) that applies to the intended use of the vehicle. After determining the vehicle's type of service, refer to the Maintenance Service Table (00–02) or the Vehicle Maintenance Schedule Tables (00–03) to determine how often maintenance should be performed.

When the vehicle reaches the distance given for a maintenance interval, see the applicable Maintenance Interval Operations Table for a list of the maintenance operations to be performed at that maintenance interval. Use the maintenance operation numbers to find detailed instructions in the manual on each operation.

Types of Service

Service Schedule I (severe service) applies to vehicles that travel less than 60,000 miles (100 000 km) annually or that operate under severe conditions. Examples of Service Schedule I usage are:

• operation on extremely poor roads or where there is heavy dust accumulation

• constant exposure to extreme hot, cold, salt air, or other extreme climates

• frequent short-distance travel

• construction-site operation

• city operation such as fire truck or garbage truck

• logging

• farm operation

Service Schedule II(long-haul transport) applies to vehicles that travel more than 60,000 miles (100 000 km) annually with minimal city or stop-and-go operation. Examples of Service Schedule II usage are:

• regional delivery that is mostly freeway miles

• interstate transport

• any highway operation with high annual mileage