This maintenance program has been based on the progress in vehicle technology and increases in oil quality to simplify the maintenance.For simplified scheduling, the program has tied maintenance to logical time or mileage limits that make it easy to anticipate needed servicing. For the majority of onhighway operators, the 24,000 km (15,000 miles) or 4 months schedule can be used with little change.It is important that the scheduled intervals are followed as limits. Maintenance can be done before either 24,000 km (15,000 miles) have been reached or before 4 months are up but must be made at or before either the mileage or the time limit has been reached.
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