2020 Chevrolet Silverado 1500 Transmission Fluid & Service Spec

Quick Answer

• Transmission Make/Model: GM 8L90 (8-speed automatic) or GM 10L90 (10-speed automatic) depending on engine and configuration.
• OEM Fluid Spec: Dexron ULV (Ultra Low Viscosity)
• Drain & Fill Capacity:
  • 8L90: Approximately 6-7 quarts
  • 10L90: Approximately 7-8 quarts
• Full Overhaul Capacity:
  • 8L90: Approximately 11 quarts
  • 10L90: Approximately 13 quarts
• Filter OEM Part Number: Verify with dealer or service manual, as there can be multiple designs and suppliers.
• Recommended Service Interval:
  • Normal Duty: 97,500 miles (150,000 km)
  • Severe Duty/Towing: 45,000 miles (72,000 km)

Fluid Type Explained

For your 2020 Chevrolet Silverado 1500, whether it’s equipped with the 8-speed GM 8L90 or the 10-speed GM 10L90 automatic transmission, the manufacturer specifies Dexron ULV (Ultra Low Viscosity) fluid. This is a synthetic fluid designed to meet the specific demands of modern GM transmissions, which operate at higher temperatures and tighter tolerances than older units. The "ULV" designation is critical; using any other type of Dexron or a different viscosity fluid can lead to premature wear, inefficient operation, and potentially costly damage to the transmission. Dexron ULV offers superior friction modification, wear protection, and thermal stability to ensure smooth shifting and long transmission life.

Always ensure any fluid you purchase explicitly states it meets the Dexron ULV specification. Most reputable aftermarket brands will clearly label their product if it meets or exceeds this standard. When in doubt, it’s always safest to opt for genuine GM Dexron ULV fluid.

Service Procedure

There are generally two methods for servicing your transmission fluid: a simple drain and fill, or a full fluid exchange (also known as a flush).

Drain & Fill: This involves draining the fluid from the transmission pan, replacing the filter (if applicable), and refilling with new fluid. This method typically replaces only a portion of the total transmission fluid, as a significant amount remains in the torque converter, valve body, and cooler lines. For the 8L90 and 10L90 transmissions, a drain and fill will replace roughly 6-8 quarts of fluid out of the full capacity of 11-13 quarts. While better than nothing, it