2020 GMC Yukon Transmission Fluid & Service

Quick Answer

• Transmission Make/Model: GM 10L80 (RPO MHS)
• OEM Fluid Spec: Dexron ULV (ultra-low viscosity) Automatic Transmission Fluid
• Drain & Fill Capacity: Approximately 7.5 – 8.5 quarts (7.1 – 8.0 liters)
• Full Overhaul Capacity: Approximately 13.0 quarts (12.3 liters)
• Filter OEM Part Number: Verify with dealer or service manual (typically AC Delco 24294194). Always verify fitment with your VIN.
• Recommended Service Interval: Every 97,500 miles (150,000 km) under normal conditions, or 45,000 miles (72,000 km) for severe duty/towing.

Fluid Type Explained: Dexron ULV for the 10L80

The 2020 GMC Yukon, when equipped with the popular 5.3L or 6.2L V8 engine, utilizes the advanced GM 10L80 10-speed automatic transmission. This modern transmission is designed for optimal efficiency and performance, and a critical component in achieving this is its specific fluid requirement: Dexron ULV (Ultra-Low Viscosity) Automatic Transmission Fluid. It is absolutely crucial to use only Dexron ULV fluid in the 10L80 transmission. Using any other type of automatic transmission fluid, such as older Dexron VI, Dexron III, or multi-vehicle fluids not specifically rated for Dexron ULV, can cause significant damage to the transmission's internal components, lead to poor shift quality, reduced fuel economy, and ultimately, premature failure. Dexron ULV is engineered to provide superior lubrication, maintain correct friction characteristics for the clutch packs, and operate efficiently across a wide range of temperatures, all while contributing to the vehicle's overall fuel efficiency goals.

Service Procedure: Drain & Fill vs. Full Exchange

Performing a transmission fluid service on your 2020 GMC Yukon is essential for its longevity. There are two primary methods:

• Drain & Fill: This is the most common and easiest DIY method. It involves draining the fluid from the transmission pan, replacing the filter, and refilling with new fluid. This method typically replaces only a portion of the total fluid volume, as a significant amount remains in the torque converter, cooler lines, and valve body. For the 10L80, a drain and fill usually takes approximately 7.5 to 8.5 quarts (7.1 to 8.0 liters) of new Dexron ULV.

• Full Fluid Exchange (Flush): A full fluid exchange, often performed by a professional shop, involves using specialized equipment to push old fluid out of the entire system (including the torque converter and cooler) while simultaneously introducing new fluid. This method replaces nearly all of the old fluid with new. While more thorough, it’s also more complex and requires more fluid—approximately 13.0 quarts (12.3 liters) for a full exchange on the 10L80. GM generally recommends against