To keep fuel systems clean, TOP TIER detergent gasoline is recommended. See Fuel (Gasoline).
If TOP TIER detergent gasoline is not available, one bottle of GM Fuel System Treatment Cleaner added to the fuel tank at every engine oil change, can help. GM Fuel System Treatment Cleaner is the only gasoline additive recommended by General Motors. It is available at your dealer.
Front Differential Carrier Cleaning and Inspection Automatic Transmission Unit
Front Differential Carrier Cleaning and InspectionCalloutComponent NameCaution:After cleaning the transmission components, allow to air dry.Do not use cloth or paper towels in order to dry any transmissioncomponents. Lint from the towels can cause componentfailure.Caution:Do not reuse cleaning solve ...