Sierra 3500 4WD V8-6.6L DSL Turbo (2007)
Engine Oil: Fluid Type Specifications
WHAT KIND OF ENGINE OIL TO USE
LOOK FOR THESE THINGS:
Oils designated as API 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.
NOTICE: Use only engine oils that have the designation CJ-4 for the diesel engine. Failure to use the recommended oil can result in engine damage not
covered by your warranty.
SAE 15W-40 is best for your vehicle. When it is very cold, below 0°F (-18°C), you should use SAE 5W-40 to improve cold starting.
These numbers on the oil container show its viscosity, or thickness. Do not use other viscosity oils such as SAE 10W-30, SAE 10W-40, or SAE 20W-50.
ENGINE OIL ADDITIVES
Do not add anything to the oil. The recommended oils with the API service symbol are all you need for good performance and engine protection.
