2016 Chevrolet Silverado 3500HD Fluid Specifications

Quick reference

Engine Oil

For the 2016 Chevrolet Silverado 3500HD, engine oil specifications vary based on the engine installed.

Gasoline Engines (6.0L V8, 6.2L V8):

• Type/Spec: SAE 5W-30. General Motors requires oils meeting the dexos1 Gen2 specification or newer (e.g., dexos1 Gen3). Look for the dexos logo on the oil bottle. This specification ensures proper engine protection, fuel economy, and emissions system compatibility.
• Capacity: Approximately 6.0 quarts (5.7 liters).
• Interval: The Engine Oil Life System (OLS) in your vehicle will determine the optimal oil change interval. It is crucial to follow the OLS message and not exceed one year between oil changes, even if the OLS does not indicate a low percentage.
• Pitfalls: Using conventional oil or oil that does not meet the dexos1 specification can lead to premature engine wear, reduced fuel economy, and potential issues with emissions components. Always ensure the oil carries the officially licensed dexos label.

Diesel Engine (6.6L LML Duramax V8):

• Type/Spec: SAE 15W-40 is generally preferred, especially in warmer climates or for heavy-duty use. SAE 5W-40 can be used for improved cold-weather starting. The oil must meet API CJ-4 or newer (e.g., CK-4). GM also recommends dexos2 certified oils for their diesel engines, ensuring optimal performance and protection for the advanced emissions systems.
• Capacity: Approximately 10.0 quarts (9.5 liters).
• Interval: As with gasoline engines, follow the Engine Oil Life System (OLS) recommendations for oil change intervals. For diesel engines, factors like idle time, towing, and regeneration cycles can influence the OLS calculation. Do not exceed one year or 7,500 miles, whichever comes first.
• Pitfalls: Using oils without the correct API classification (CJ-4 or newer) or neglecting the dexos2 recommendation can harm the engine, especially the Diesel Particulate Filter (DPF) and other emissions components, leading to costly repairs. Never use oils not designed for diesel engines with DPFs.

Engine Coolant

• Type/Spec: DEX-COOL, which is a long-life, Ethylene Glycol-based Organic Acid Technology (OAT) coolant. It is typically orange or pink in color. GM specifies GM Spec 6277M.
• Capacity: Total system capacity is approximately 16-17 quarts (15.1-16.1 liters). Always verify the exact capacity in your owner's manual for proper fill levels during service.
• Interval: DEX-COOL is designed for extended service intervals, typically 5 years or 150,000 miles, whichever comes first. However, regular inspection of coolant levels and condition is always recommended.
• Pitfalls: Mixing DEX-COOL with conventional green (inorganic additive technology, IAT) or other coolant types (e.g., HOAT) can lead to chemical reactions that cause gel formation, corrosion, and severe damage to the cooling system. Always flush the system thoroughly if switching coolant types, although it is best to stick with DEX-COOL. Ensure proper 50/50 coolant/distilled water mix for optimal freeze protection and corrosion resistance.

Transmission Fluid

General Motors 6L90 Automatic Transmission:

• Type/Spec: DEXRON-VI Automatic Transmission Fluid. This is a synthetic blend fluid specifically engineered for GM's latest generation of transmissions, providing improved friction durability, wear protection, and viscosity stability.
• Capacity: A drain and fill typically requires around 7.0 quarts (6.6 liters), but a complete overhaul or flush can be upwards of 12.0-13.0 quarts (11.4-12.3 liters). Always check the fluid level using the manufacturer's specified procedure.
• Interval: GM considers the transmission fluid a