For the 2021 Chevrolet Tahoe equipped with the 3.0L 6-cylinder LM2 T Diesel Turbo engine, the oil capacity is 7 quarts (including filter replacement). The recommended viscosity for all temperatures is 0W-20. AMSOIL recommends using AMSOIL 0W-20 100% Synthetic Diesel Oil (DP020QT-EA) paired with a WIX Oil Filter (WL10351-EA) for optimal protection.
What oil does a 2021 Chevrolet Tahoe 3.0L Diesel take?
The 2021 Chevrolet Tahoe with the 3.0L 6-cylinder LM2 T Diesel Turbo engine requires an oil viscosity of 0W-20 for all temperature ranges. The AMSOIL lookup oil grade is SEOA5. For vehicles originally using GM Dexos2, the lookup note states you may use a GM Dexos D licensed engine oil of the appropriate viscosity grade.
AMSOIL product recommendations
Based on the AMSOIL lookup for the 2021 Chevrolet Tahoe 3.0L Diesel, the following products are recommended to maintain engine and component health.
Engine Oil & Filter
| Product Name | Part Code |
|---|---|
| AMSOIL 0W-20 100% Synthetic Diesel Oil | DP020QT-EA |
| WIX Oil Filter | WL10351-EA |
Coolant & Transmission Fluids
| Product Name | Part Code |
|---|---|
| AMSOIL Passenger Car & Light Truck Antifreeze & Coolant | ANTPC1G-EA |
| AMSOIL Propylene Glycol Antifreeze and Engine Coolant | ANT1G-EA |
| AMSOIL Signature Series ULV 100% Synthetic ATF | ULVPK-EA |
Transfer Case & Differential
| Product Name | Part Code |
|---|---|
| AMSOIL Signature Series Fuel-Efficient ATF | ATLPK-EA |
| AMSOIL OE Fuel-Efficient 100% Synthetic ATF | OTLQT-EA |
| AMSOIL SEVERE GEAR® 75W-85 Synthetic Gear Lube | SVLPK-EA |
Engine Oil Specifications
| Specification | Value |
|---|---|
| Oil Viscosity | 0W-20 (All TEMPS) |
| AMSOIL Lookup Oil Grade | SEOA5 |
Engine Oil Capacity
| Description | Capacity |
|---|---|
| Oil Capacity (with filter) | 7 quarts |
Note: After refilling, always check the oil level.
Engine Oil Service Details
- Oil Drain Plug Torque: 18 ft/lbs
How much transmission fluid does it take?
The automatic transmission for this vehicle is the 10L80. The AMSOIL lookup notes that the WSS-M2C949-A specification was developed by Ford and GM, and products meeting this spec are available under DEXRON ULV and MERCON ULV tradenames.
Transmission Capacity Details
| Configuration | Total Fill Capacity |
|---|---|
| 10-speed with O Cooler (10L80) | 11.5 quarts |
| 10-speed with Cooler (10L80) | 12 quarts |
| Initial Fill | 8.1 quarts |
Transfer Case and Differential Specifications
The transfer case requires specific attention to the identification tag on the case for correct fluid selection. For this application, the AMSOIL lookup lists products for MP3015 and 25 configurations.
Transfer Case Service
| Component | Torque Spec |
|---|---|
| Transfer Case Drain Plug | 15 ft/lbs |
| Transfer Case Fill Plug | 15 ft/lbs |
Capacity: 3.2 pints (for MP3015, 25). Check the tag on the case for identification.
Front Differential Service
| Component | Capacity |
|---|---|
| Front Differential | 2.3 pints |
Coolant Specifications
The cooling system requires a capacity of 21.9 quarts. AMSOIL offers both pre-mix and concentrated options for this application.
| Product Type | Formulation |
|---|---|
| AMSOIL Passenger Car & Light Truck | Ethylene glycol 50/50 pre-mix |
| AMSOIL Propylene Glycol | Concentrated (requires mixing) |
Diesel maintenance notes for this vehicle
Because the LM2 is a specialized diesel turbo engine, maintenance requirements differ significantly from gasoline-powered V8 counterparts. Owners should prioritize:
- Adherence to strict oil change intervals to protect the diesel injection system and emissions hardware.
- Regular inspection of the turbocharger.
- Monitoring fuel filtration and Diesel Exhaust Fluid (DEF) levels.
Common diesel oil-related concerns and how AMSOIL products may help
| Concern | Why it matters | AMSOIL Product | How it may help | Limitation |
|---|---|---|---|---|
| Wear Protection | Diesel engines face high pressure/friction. | DP020QT-EA | Delivers up to 6X more wear protection than leading industry standards. | Requires proper service intervals. |
| Temperature Extremes | Cold starts or high heat can degrade oil. | DP020QT-EA | Excels in hot and cold temperature extremes. | N/A |
| Transmission Heat | Heavy towing generates high ATF temperatures. | ULVPK-EA | Withstands rigors of heavy towing and elevated temperatures. | N/A |
Common maintenance concerns for this vehicle
Based on owner reports and technical research, owners should be aware of the following:
- Steering Assist: Some software issues may cause a loss of power steering assist at startup or while driving.
- Braking Performance: Incorrectly calibrated brake modules can affect ESC, traction control, and ABS, especially when towing.
- Driveline Integrity: Potential for driveshaft failure if internal components were not heat-treated properly.
Recall, TSB, and manufacturer communication notes
NHTSA research indicates several active recalls for the 2021 Chevrolet Tahoe. These include software updates for the steering control module, brake system recalibration, and replacement of rear wheel driveshaft assemblies. Always verify open recalls by your specific VIN through a certified dealer or the NHTSA website.
About this vehicle
The 2021 Chevrolet Tahoe is a full-size SUV that serves as a shorter-wheelbase variant of the Chevrolet Suburban. This specific model features the 3.0L 6-cylinder Duramax diesel engine (Engine Code LM2), which represents a specialized powertrain option within the GM diesel ecosystem.
Unlike the traditional LS-based small-block V8 engines commonly found in other Tahoe generations, the LM2 is a specialized diesel turbo engine. This means maintenance profiles emphasize diesel-specific components such as fuel filtration and emissions hardware protection. Typical use cases for this vehicle include heavy-duty towing, long-distance highway cruising, and large-capacity passenger transport. Because of its chassis commonality with other GM trucks like the Silverado, owners should be prepared for a maintenance profile that prioritizes high-quality diesel fluids and turbocharger care.
Common questions about this vehicle’s diesel oil and maintenance
What is the engine oil capacity for my 3.0L Duramax Tahoe?
The capacity is 7 quarts when performing an oil change with a new filter. Always check the level after refilling.
What viscosity should I use for the 2021 Tahoe diesel?
The recommended viscosity is 0W-20 for all temperature ranges. AMSOIL recommends DP020QT-EA.
Can I use Dexos2 oil in this diesel engine?
The AMSOIL lookup note states that vehicles equipped with diesel engines that originally used GM Dexos2 may use a GM Dexos D licensed engine oil of the appropriate viscosity grade.
How often should I change my transmission fluid?
While specific intervals depend on usage, AMSOIL products like ULVPK-EA are designed to withstand heavy towing and challenging terrain.
What is the torque spec for my oil drain plug?
The oil drain plug should be torqued to 18 ft/lbs.
How do I verify if my Tahoe has an open recall?
You should contact a Chevrolet dealer or use your VIN on the official NHTSA website to check for active recalls regarding steering, brakes, or driveshafts.
Disclaimer: Not all information provided is verified by the manufacturer. Always consult your owner’s manual and verify all specifications and recall status via your VIN before performing maintenance.