1996 GMC Savana Van Owner's Manual - Page 338

I Long Tripmighway Maintenance Schdule -- basolme 100,000 M FS 1 (166 000 km) (Continued) - 0Change automatic transmission fluid and filter if the vehicle's GVWR is over 8600 lbs. or if the vehicle is mainly driven under one or more of these conditions: - 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. L I S ~your [ f ' y c ~ not do vehicle Llnder m y oj' these conditions, the Jluid and jilter do not require clzmging. 17 Inspect Positive Crankcase Ventilation ( P c v ) valve. AII Ernission Control Sewice. I DATE I I ACTUAL MILEAGE SERVICED B Y 3 7-42