1994 Buick Park Avenue Owner's Manual - Page 290

Scheduled Maintenance Services Schedule I - ~~~~ Follow Schedule I if your car is MAINLY driven under one or more of the following conditions: When most trips are less than 4 miles (6 kilometers). When most trips are less than 10 miles (16 kilometers) and outside temperatures remain below freezing. When most trips include extended idling and/or frequent low-speed operation as in stop-and-go traffic. Towing a trailer.*? When operating in dusty areas. Schedule I should alsobe followed if the car is used for delivery service, police, taxi or other commercial applications. 288