1995 GMC Yukon Owner's Manual - Page 427

Maintenance Schedule II - Gasoline Engines With Heavy Duty Emissions I I DATE ACTUAL MILEAGE SERVICED BY: 50,000 Miles ( 3 000 km) 8 0 Change automatic transnlission fluid and filter if the vehicle is mainly driven under one or more of these conditions: 0 In heavy city traffic where the outside temperature regularly reaches 90°F (32°C) or higher. In hilly or mountainous terrain. When doing frequent trailer towing. Uses such as found in taxi, police or delivery service. 0 DATE ACTUAL SERVICED MILEAGE BY: 7-59