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I do not have a GM product but this is my maint. pattern
5k miles: change oil, oil filer and air filter
next 5k miles, chang oil, oil filter and fuel filter
1 a yr have chassis lubed
20-25k miles have transmission fluid and filter changed (miles depends on how much I tow the trailer) but no more than 25k mi before I have tranny serviced.
I have yet to have a problm with anything yet. (knock on wood)
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