GMC Duramax Diesel 2015 Owner's Manual page 111

11-8 Service and Maintenance
Recommended Fluids
Recommended Fluids and Lubricants
Fluids and lubricants identified below by name, part number, or specification can be obtained from your dealer.
Usage
Engine Oil
Engine Coolant
Hydraulic Brake System
Windshield Washer
Diesel Exhaust Aftertreatment
System
Van Models: Parking Brake Cable
Guides
Power Steering System
Engine oils with the letters CJ-4 are required for your vehicle. The CJ-4
designation can appear either alone or in combination with other American
Petroleum Institute (API) designations, such as API CJ-4/SL. These letters
show API levels of quality. To determine the preferred viscosity for your
vehicle's diesel engine, see Engine Oil on page 10-6.
50/50 mixture of clean, drinkable water and use only DEX-COOL
See Engine Coolant on page 10-18.
DOT 3 Hydraulic Brake Fluid (GM Part No. 19299818, in
Canada 19299819).
Automotive windshield washer fluid that meets regional freeze protection
requirements.
Diesel Exhaust Fluid (GM Part No. 19286291, in Canada 88862660) or
diesel exhaust fluid that meets ISO 22241-1 or displays the API Diesel
Exhaust Fluid Certification Mark.
Chassis Lubricant (GM Part No. 12377985, in Canada 88901242) or
lubricant meeting requirements of NLGI #2, Category LB or GC-LB.
GM Power Steering Fluid (GM Part No. 89021185, in Canada 89021186).
Fluid/Lubricant
®
coolant.