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Q: 100,000 miles on 2007 Chevrolet Trailblazer

what services needs to be done at 100,000 miles
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In addition to the Maintenance Minder service, GM recommends replacement of the Air Filter, Spark Plugs, Transfer Case Fluid and the Automatic Transmission Fluid/Filter. You can get this estimate if you look under "Scheduled Maintenance" in the RepairPrice Estimator. and select the Maintenance I or II service.
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