Almost all GM cars and light trucks state in the owners manual 100,000
miles for trans. service with filter, "under normal driving conditions". It also gives a 50,000 mile service interval "under severe driving conditions". If you live in California your driving conditions meet severe criteria. Here is the criteria.
• 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.
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