1993 Buick Regal Owner's Manual - Page 272

Scheduled Maintenance Services Schedule I Follow Schedule I if your car is MAINLY driven under one or more of the following conditions: 0 When most trips are less than 4 miles (6 kilometers). 0 When most trips are less than 10 miles (16 kilometers) and outside temperatures remain below freezing. 0 When most trips include extended idling and/or frequent low-speed operation as in stop-and-go traffic. 0 Towing a trailer.*? When operating in dusty areas. Schedule I should also be followed if the car is used for delivery service, police, taxi or other commercial applications. I TO BE SERVICED (See Explanationof Scheduled Maintenance Services Following Schedules I and 11) Item No. 1. Engine Oil & Oil Filter 65 70 75 0 . 0 0 80 0 0 Change* 2. Chassis Lubrication 3. Throttle Body Mounting Bolt Torque* 4 Tire & Wheel Inspection & . Rotation 5. Engine Accessory Drive ' Belt(s) Inspection* 6 . Cooling System Service* 270