GMC Acadia Transmission Fluid: Which Type to Use and How to Confirm It
The short answer
Most GMC Acadias built with a six-speed automatic, which covers the first generation (2007 to 2016) and the early second generation, are specified for GM Dexron VI automatic transmission fluid. Dexron is GM's own fluid standard, so the name on the bottle matters more than the brand. Look for a fluid that states it is GM-licensed or approved for Dexron VI, not just "suitable for" or "compatible with" it.
The one condition that changes this answer is the transmission itself. Later Acadias moved to newer GM automatics with more gears, and GM has introduced newer Dexron grades for some of its recent transmissions. If your Acadia has a nine-speed or eight-speed automatic, do not assume Dexron VI is correct. Confirm the spec before you buy fluid.
How the answer varies by generation
Acadia range | Transmission type | Fluid guidance | Confidence; First generation (2007–2016) | Six-speed automatic | Dexron VI | Well established; confirm with the owner's manual; Second generation, earlier years with a six-speed | Six-speed automatic | Dexron VI | Generally applies; confirm by model year and engine; Second generation, later years with a nine-speed | Nine-speed automatic | Check the owner's manual or a GM dealer | Not confirmed here; a different Dexron grade may apply; Third generation (2024 onward) | Newer GM automatic | Check the owner's manual or a GM dealer | Not confirmed here
Gaps to note: the evidence for this guide does not establish which exact model years and engines in the second generation switched from the six-speed to the nine-speed. It also does not establish the specified fluid for the nine-speed or for the third-generation Acadia. Trim level, such as SLE, SLT, AT4 or Denali, does not change the fluid on its own. The engine and transmission pairing is what determines it. Market differences outside North America are also not covered here.
How to confirm the exact fluid for your Acadia
Check the fluids and capacities section of the owner's manual for your model year; it names the Dexron grade required. Look at the transmission fill cap or nearby labeling under the hood; some GM vehicles show the fluid specification there. Give a GM dealer parts counter your VIN (vehicle identification number). They can identify the exact transmission and fluid from it. If you buy online or at a parts store, use a lookup that asks for your engine and transmission, not just the year and model.
Dexron VI and older Dexron grades
Dexron VI replaced the earlier Dexron III standard, and GM states that Dexron VI can be used in transmissions that originally called for Dexron III. That backward compatibility only runs one way. A bottle labeled only Dexron III, or Dexron III/Mercon, should not go into an Acadia that calls for Dexron VI. Do not assume Dexron VI is interchangeable with GM's newer grades either. Use whichever grade your manual names.
Fluid that is not transmission fluid
On all-wheel-drive Acadias, the transfer case (the unit that sends power to the rear axle) and the rear drive module have their own lubricants, and these are generally not automatic transmission fluid. If you are servicing those components, look up their specifications separately. This guide does not include them.
What this guide does not cover
Fluid capacities, change intervals and prices were not in the evidence for this guide, so none are given here. Capacity also differs between a drain-and-fill and a full flush. Use the figure in your owner's manual or service information for your specific transmission rather than a general number.