GMC Yukon 2021 Owner's Manual page 394

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 or specification, including fluids or lubricants not listed here, can be obtained from your dealer.
Usage
Automatic Transmission
Chassis Lubrication
Engine Coolant
Engine Oil
Front Axle (4WD Only) and Rear Axle.
Hydraulic Brake System
Key Lock Cylinders, Hood Hinges, Body Door
Hinge Pins, Power Assist Steps, Liftgate Hinge,
and Fuel Door Hinge
Transfer Case (4WD Only)
Weatherstrip Conditioning
Windshield Washer
DEXRON ULV Automatic Transmission Fluid.
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
0 319.
Engine oil meeting the dexos1 specification of the proper SAE viscosity grade. ACDelco dexos1
full synthetic is recommended. See Engine Oil 0 315.
See your dealer.
DOT 4 Hydraulic Brake Fluid.
Multi-Purpose Lubricant, Superlube. See your dealer.
See your dealer.
Weatherstrip lubricant. See your dealer.
Automotive windshield washer fluid that meets regional freeze protection requirements.
Service and Maintenance
Fluid/Lubricant
393