1999 GMC Sonoma Owner's Manual - Page 356

yellowblue Part D: Recommended Fluids and Lubricants NOTE: Fluids and lubricants identified below by name, part number or specification may be obtained from your dealer. USAGE Engine Oil FLUID/LUBRICANT Engine Oil with the American Petroleum Institute Certified For Gasoline Engines "Starburst" symbol of the proper viscosity. To determine the preferred viscosity for your vehicle's engine, see "Engine Oil" in the Index. 50/50 mixture of clean, drinkable water and use only GM GoodwrenchR DEX-COOLR or HavolineR DEX-COOLR Coolant. See "Engine Coolant" in the Index. Delco Supreme 11R Brake Fluid (GM Part No. 12377967 or equivalent DOT-3 Brake Fluid). USAGE Windshield Washer Solvent FLUID/LUBRICANT GM OptikleenR Washer Solvent (GM Part No. 1051515) or equivalent. Hydraulic Clutch Hydraulic Clutch Fluid (GM Part System No. 12345347 or equivalent DOT-3 Brake Fluid). Power Steering System Manual Transmission with V6 Engine Manual Transmission with L4 Engine Automatic Transmission Key Lock Cylinders GM Power Steering Fluid (GM Part No. 1052884 - 1 pint, 1050017 - 1 quart, or equivalent). Synchromesh Transmission Fluid (GM Part No. 12345349 or equivalent). Friction Modified Synchromesh Transmission Fluid (GM Part No. 12377916). DEXRONR-III Automatic Transmission Fluid. Multi-Purpose Lubricant, SuperlubeR (GM Part No. 12346241 or equivalent). Engine Coolant Hydraulic Brake System 7-48