2009 GMC Yukon Owner's Manual - Page 533

Underbody Flushing Service At least every spring, use plain water to flush any corrosive materials from the underbody. Take care to clean thoroughly any areas where mud and other debris can collect. Recommended Fluids and Lubricants Fluids and lubricants identified below by name, part number, or specification can be obtained from your dealer/retailer. Fluid/Lubricant Engine oil which meets GM Standard GM6094M and displays the American Petroleum Institute Certified for Gasoline Engines Engine Oil starburst symbol. To determine the proper viscosity for your vehicle's engine, see Engine Oil on page 5-15. 50/50 mixture of clean, drinkable water and use only DEX-COOL® Engine Coolant Coolant. See Engine Coolant on page 5-29. Usage Fluid/Lubricant DOT 3 Hydraulic Brake Fluid Hydraulic Brake (GM Part No. U.S. 12377967, System in Canada 89021320). Windshield Optikleen® Washer Solvent. Washer GM Power Steering Fluid Power Steering (GM Part No. U.S. 89021184, System in Canada 89021186). Automatic DEXRON®-VI Automatic Transmission Transmission Fluid. Multi-Purpose Lubricant, Superlube Key Lock (GM Part No. U.S. 12346241, Cylinders in Canada 10953474). Chassis Lubrication Front Axle (1500 Series Vehicles with Four-Wheel Drive) Chassis Lubricant (GM Part No. U.S. 12377985, in Canada 88901242) or lubricant meeting requirements of NLGI #2, Category LB or GC-LB. SAE 80W-90 Axle Lubricant (GM Part No. U.S. 89021671, in Canada 89021672). Usage 6-13