For the 2016 GMC Sierra 3500 Pickup with the 6.6L 8-cylinder LML Diesel Turbo engine, the oil capacity is 10 quarts (including filter replacement). The preferred viscosity for temperatures above -18°C is SAE 15W-40, though 5W-40 is recommended for all temperatures when ambient conditions are below 0°F (-18°C) to improve cold starting. AMSOIL recommends using Signature Series 15W-40 Max-Duty Diesel Oil or 15W-40 Heavy-Duty Synthetic Diesel Oil paired with a high-efficiency oil filter.
What oil does a 2016 GMC Sierra 3500 6.6L LML take?
The 2016 GMC Sierra 3500 with the 6.6L Duramax diesel engine requires an oil meeting the CJ-4 specification. For most operating conditions where temperatures remain above -18°C (0°F), SAE 15W-40 is the preferred viscosity. However, if you operate in extreme cold, using a 5W-40 viscosity can help improve engine starting performance.
AMSOIL product recommendations
Based on the AMSOIL lookup for your 2016 GMC Sierra 3500, here are the recommended fluids and filters to maintain peak performance and protect your Duramax engine.
Engine Oil Options
| Product Name | Viscosity | Product Code |
|---|---|---|
| AMSOIL Signature Series 15W-40 100% Synthetic Max-Duty Diesel Oil | 15W-40 | DMEQT-EA |
| AMSOIL 15W-40 Heavy-Duty 100% Synthetic Diesel Oil | 15W-40 | ADPQT-EA |
Oil Specification: CJ-4
Oil Filter Options
| Product Name | Part Number/Code |
|---|---|
| AMSOIL Oil Filter | EAO52-EA |
| WIX XP Oil Filter | 57202XP-EA |
| WIX Oil Filter | 57202-EA |
Air Filter & Coolant
| Component | Product Name | Code |
|---|---|---|
| Air Filter | WIX Air Filter [1] | 49314-EA |
| Coolant | AMSOIL Passenger Car & Light Truck Antifreeze & Coolant | ANTPC1G-EA |
| Coolant | AMSOIL Propylene Glycol Antifreeze and Engine Coolant | ANT1G-EA |
Engine Oil Specifications & Capacity
| Detail | Specification/Value |
|---|---|
| Oil Viscosity (Preferred) | 15W-40 (Above -18°C) |
| Oil Viscosity (Cold Start) | 5W-40 (All Temps below -18°C) |
| Oil Grade/Spec | CJ-4 |
| Oil Capacity | 10 quarts (with filter) |
| Oil Drain Plug Torque | 18 ft/lbs |
Note: Always check the oil level after refilling.
Diesel maintenance notes for this vehicle
Maintaining a Duramax LML engine requires attention to high-pressure fuel systems, turbocharger integrity, and emissions components. Because the 3500 series is designed for heavy-duty hauling, regular inspections of the drivetrain, braking systems, and suspension are essential.
- Oil Changes: Use high-quality diesel-specific filtration to protect the turbocharger.
- Cold Weather: If operating in environments below 0°F, consider a 5W-40 viscosity for better lubrication during startup.
- Drain Plug: Ensure the drain plug is torqued to 18 ft/lbs to prevent leaks.
Common diesel oil-related concerns and how AMSOIL products may help
Diesel engines face unique stresses such as soot loading and high heat. The following table outlines how specific AMSOIL products can support your maintenance needs.
| Concern | Why it matters | AMSOIL Product | How it may help | Limitation |
|---|---|---|---|---|
| Engine Wear | High-pressure diesel environments cause friction. | DMEQT-EA | Delivers up to 6X more wear protection. | Requires regular oil changes. |
| Contaminants | Small particles can damage engine components. | EAO52-EA | 99% efficiency at 20 microns. | Filter must be replaced per interval. |
| Cold Starts | Thick oil can hinder startup in winter. | 5W-40 Viscosity options | Improves cold starting below -18°C. | Check local temperature requirements. |
Common maintenance concerns for this vehicle
Based on owner reports and research, owners of the 2016 GMC Sierra 3500 should be aware of several areas that may require attention:
- Turbocharger/Engine Power: Some users have reported “Reduced Engine Power” modes, which can be linked to turbo vane position sensors or boost faults.
- Fuel System: Maintaining the high-pressure fuel system and fuel pump is critical for long-term reliability.
- Braking Systems: Regular inspection of hydraulic brake pedal linkages is recommended.
Note: Owner reports are not verified defects; they are individual experiences reported to the NHTSA.
Recall, TSB, and manufacturer communication notes
The following recall information has been identified via NHTSA research for the 2016 GMC Sierra 3500:
- Brake Pedal Linkage: A recall (Campaign 18V578000) was issued because the brake pedal pivot nut may loosen, potentially making the pedal inoperative or interfering with the accelerator. The remedy involves adding adhesive and increasing tightness to the nut.
- Fuel System (Gasoline Models): While this vehicle is a diesel, NHTSA notes a recall for certain 3500 trucks regarding fuel-level sensors that could cause tank overfilling.
Important: Always verify open recalls by contacting a local dealer with your specific VIN.
About this vehicle
The 2016 GMC Sierra 3500 is a heavy-duty pickup truck engineered for high payload and significant towing capacities. It is frequently utilized in commercial, agricultural, or serious recreational hauling applications. This model features the 6.6L V8 Diesel engine (Engine Code: LML), which is part of the renowned Duramax diesel family.
The Duramax LML is a cornerstone of GM’s heavy-duty powertrain, known for its ability to handle high-stress environments. Owners typically focus on maintaining the integrity of the turbocharger, fuel injection system, and emissions components to ensure long-term reliability. Because these vehicles are often used in demanding roles, regular maintenance of all fluids—including transmission, differential, and coolant—is essential. As noted in vehicle research, users should always verify specific service intervals through an official GM service guide or workshop manual.
Common questions about this vehicle’s diesel oil and maintenance
How much oil does my 6.6L LML Duramax take?
The engine requires 10 quarts of oil when performing a change that includes the oil filter.
What is the best oil viscosity for winter driving?
When ambient temperatures drop below 0°F (-18°C), using a 5W-40 viscosity is recommended to improve cold starting performance.
Can I use any diesel oil in my Sierra 3500?
The AMSOIL lookup specifies an oil grade of CJ-4 for this application. Using oils that meet this specification helps protect the engine components.
How often should I change my oil filter?
While specific intervals depend on usage, using high-efficiency filters like the EAO52-EA can help manage wear-causing contaminants and support extended service life.
What should I do if my truck enters ‘Reduced Engine Power’ mode?
This can be related to turbocharger or sensor issues. You should have the vehicle inspected by a professional, as some owners have reported this in relation to turbo vane position sensors.
How do I check for active recalls on my GMC Sierra?
You should contact a GM dealer or visit the official NHTSA website and provide your Vehicle Identification Number (VIN) to check for any outstanding safety recalls.
Disclaimer: This information is derived from provided AMSOIL and NHTSA data. Always consult your owner’s manual or a certified mechanic before performing maintenance.