1995 GMC Sonoma Owner's Manual - Page 328

Part D: Recommended Fluidsand Lubricants NOTE: Fluids and lubricants identified below by name, part number or specification may be obtained from your GM 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 "EngineOil" in the Index. Mixture of water and a good quality ethylene glycol base antifreeze conforming to GM Specification 6038-M (4.3L) or GM Specification 6043-M (2.2L). GM Part No. 3634621 or equivalent with a complete flush and refill. Delco Supreme I 1 Brake Fluid (GM Part No. 1052535 or equivalent DOT-3 brake fluid). @ Engine Coolant Coolant Supplement Hydraulic Brake System Hydraulic Clutch System Power Steering System Hydraulic Clutch Fluid (GM Part No. 12345347 or equivalent). GM Power Steering Fluid (GM Part No. 1 OS00 17 or equivalent) conforming to GM Specification 99850 10. Manual Transmission (2.2L Engine) DEXRON@-111 Automatic Transmission Fluid. Manual Transmission (4.3L Engine) Synchromesh Transmission Fluid (GM Part No. I2345349 or equivalent). Automatic Transmission Key Lock Cylinders DEXRON@-I11 Automatic Transmission Fluid. Lubricate with Multi-Purpose Lubricant (GM Part No. 12345120) or synthetic SAE SW-30 engine oil. 7-40