GMC SIERRA 2020 Owner's Manual page 453

452 Service and Maintenance
Recommended Fluids, Lubricants, and Parts
Recommended Fluids and Lubricants
This maintenance section applies to vehicles with a gasoline engine. If the vehicle has a diesel engine, see
Recommended Fluids and Lubricants in the Duramax diesel supplement.
Fluids and lubricants identified below by name, part number, or specification can be obtained from your dealer.
Usage
Automatic Transmission (6-Speed
Transmission)
Automatic Transmission (8-Speed
Transmission)
Automatic Transmission (10-Speed
Transmission)
Chassis Lubrication
Engine Coolant
Engine Oil
Front and Rear Axle Driveshaft
Splines
DEXRON-VI Automatic Transmission Fluid.
DEXRON-HP Automatic Transmission Fluid.
DEXRON ULV Automatic Transmission Fluid.
Chassis Lubricant (GM Part No. 12377985, in Canada 88901242) or
lubricant meeting requirements of NLGI #2, Category LB or GC-LB.
50/50 mixture of clean, drinkable water and use only DEX-COOL coolant.
See Cooling System 0 346.
Engine oil meeting the dexos1 specification of the proper SAE viscosity
grade. ACDelco dexos1 full synthetic is recommended. See Engine Oil
0 339.
Spline Lubricant, Special Lubricant (GM Part No. 19257121, in
Canada 19257122).
Fluid/Lubricant