1997 GMC Sonoma Owner's Manual - Page 362
1997 GMC Sonoma Manual
Page 362 highlights
Long Tripmighway Maintenance Schedule 100,000 Miles (166 000 km) 0Inspect spark plug wires. An Emission Control Service. 0Replace spark plugs. An Emission Control Service. 0Change automatic transmissionfluid and filter if the vehicle is mainly driven under one or more of these conditions: In heavy city traffic where theoutside temperature regularly reaches 90 F (32°C) or higher. - In hilly or mountainous terrain. - When doing frequent trailer towing. - 7 -52
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