Owner's Manual
Page 334
...) Inspect spark plug wires. Pressure test the cooling system and pressure cap. When doing frequent trailer towing. - Clean radiator, condenser, pressure cap and neck. I MaintenanceSchedule I MILEAGE 150,000 Miles (240 000 km) 0 Drain, flush and refill cooling system (or every 60 months since last service, whichever occurs first). In heavy city traffic...
...) Inspect spark plug wires. Pressure test the cooling system and pressure cap. When doing frequent trailer towing. - Clean radiator, condenser, pressure cap and neck. I MaintenanceSchedule I MILEAGE 150,000 Miles (240 000 km) 0 Drain, flush and refill cooling system (or every 60 months since last service, whichever occurs first). In heavy city traffic...