2016 GMC Sierra 2500HD Coolant Capacity & Type

The 2016 GMC Sierra 2500HD holds approximately 18.7 quarts (17.7 liters) of coolant with the 6.0L V8 engine.

Quick Answer

• Total Cooling System Capacity (6.0L V8): 18.7 quarts (17.7 liters)
• OEM Coolant Spec: Dex-Cool compatible, Orange/Pink, OAT (Organic Acid Technology)
• Mix Ratio: 50/50 Pre-mix or Concentrate mixed 50/50 with distilled water

Capacity by Engine Option

Flush Interval

• Normal Duty: Every 5 years or 150,000 miles, whichever comes first.
• Severe Duty: Consider more frequent inspections and flushes, especially if towing heavy loads regularly, operating in extreme temperatures, or experiencing stop-and-go traffic consistently. A good rule of thumb for severe duty would be every 3 years or 50,000 miles.

How to Refill & Bleed

When refilling and bleeding the cooling system on your 2016 GMC Sierra 2500HD, proper technique is crucial to avoid air pockets, which can lead to overheating.

1. Safety First: Ensure the engine is completely cool before starting. Wear appropriate personal protective equipment.
2. Drain Old Coolant: Locate the radiator drain petcock (usually at the bottom of the radiator) and open it. Remove the radiator cap to allow for faster draining. Collect the old coolant in a suitable drain pan and dispose of it responsibly.
3. Flush (Optional but Recommended): If performing a full flush, close the drain and fill with distilled water. Run the engine with the heater on high until it reaches operating temperature. Drain again. Repeat this process until the water runs clear. For a thorough flush, consider using a cooling system flush product according to its directions, followed by several distilled water rinses.
4. Refill with New Coolant: Close the radiator drain. Begin filling the system slowly through the radiator cap opening with the specified Dex-Cool compatible 50/50 coolant mix. Some 2016 GMC Sierra 2500HD models may have an air bleeder screw on the thermostat housing or an upper radiator hose, which can be opened to release trapped air while filling.
5. Bleed the System: Once filled to the "COLD FILL" line on the reservoir, leave the radiator cap off (or slightly loose if instructed by owner