2019 Chevrolet Tahoe: Fluid Type Specs

Quick Reference

Fluid	Type/Spec	Capacity
Engine Oil	SAE 0W-20 / dexos1 Gen 2	8.0 qt / 7.6 L (5.3L V8)
Engine Coolant	ACDelco DEX-COOL Orange (OAT)	14.2 qt / 13.4 L (5.3L V8)
Automatic Transmission Fluid	DEXRON VI	12.4 qt / 11.7 L (6L80 6-speed)
Transfer Case Fluid	DEXRON VI	1.6 qt / 1.5 L (Auto 4WD)
Front Differential Gear Oil	SAE 75W-90 Synthetic	~1.7 qt / 1.6 L
Rear Differential Gear Oil	SAE 75W-85 Synthetic	~2.75 qt / 2.6 L
Brake Fluid	DOT 3	As needed
Power Steering Fluid	ACDelco Power Steering Fluid	As needed
Windshield Washer Fluid	Good quality solvent	~1.0 gal / 3.8 L

Engine Oil

The 2019 Chevrolet Tahoe with the 5.3L V8 engine requires SAE 0W-20 viscosity grade engine oil that meets the GM dexos1 Gen 2 specification. This is a full synthetic oil designed for modern gasoline direct injection (GDI) engines to prevent low-speed pre-ignition (LSPI), improve fuel economy, and extend drain intervals. Using an oil that is not dexos1 approved can lead to engine damage and may void your new vehicle warranty. API SN PLUS or SP Resource Conserving oils are also suitable substitutes. The total oil capacity with a filter change is 8.0 quarts (7.6 liters). An oil change is one of the most common and critical maintenance items. Always verify the oil level on the dipstick after an oil change. The factory oil life monitoring system will alert you when it's time for a change, but a good rule of thumb is every 7,500 miles or once a year for synthetic oil.

Engine Coolant

All 2019 Chevrolet Tahoes use ACDelco DEX-COOL Orange engine coolant. This is an Organic Acid Technology (OAT) coolant, which is crucial for protecting the aluminum components in the cooling system. Never mix DEX-COOL with other coolant types, such as traditional green Inorganic Additive Technology (IAT) or even Hybrid OAT (HOAT) coolants, as this can cause gelling and lead to cooling system blockages and overheating. The cooling system capacity for the 5.3L V8 is approximately 14.2 quarts (13.4 liters) for a complete flush. A 50/50 mixture of DEX-COOL concentrate and distilled water is recommended. It is important to use distilled water, as tap water contains minerals that can cause scaling and corrosion in the cooling system. The service interval for DEX-COOL is typically 5 years or 150,000 miles, but it's always a good idea to inspect the coolant level and condition at every oil change.

Transmission Fluid

The 6-speed 6L80 automatic transmission in the 2019 Tahoe requires DEXRON VI automatic transmission fluid. This is a full synthetic fluid with specific frictional properties for smooth shifting and long-term durability. Do not use "universal" or multi-vehicle ATFs, as they may not meet the stringent requirements of the DEXRON VI specification. A complete fluid and filter change will require approximately 12.4 quarts (11.7 liters) of fluid. Transmission fluid service is recommended every 45,000 miles for severe service (towing, heavy loads) or 90,000 miles for normal service. Some transmissions have a "fill-for-life" claim, but most technicians recommend regular fluid changes to ensure a long service life.

Transfer Case Fluid

For four-wheel-drive models, the transfer case also uses DEXRON VI automatic transmission fluid. The capacity is approximately 1.6 quarts (1.5 liters). The transfer case fluid should be changed at the same intervals as the transmission fluid. It is important to check the fluid level and condition periodically, especially if you frequently use four-wheel drive.

Differential Gear Oil

The front differential on 4WD models requires SAE 75W-90 synthetic gear oil. The capacity is around 1.7 quarts (1.6 liters). The rear differential specification is SAE 75W-85 synthetic gear oil, with a capacity of about 2.75 quarts (2.6 liters). For models with the G80 locking rear differential, a limited-slip additive is not required, as the locking mechanism is self-contained. Always use a high-quality synthetic gear oil to protect against extreme temperatures and loads. The service interval is typically every 50,000 to 100,000 miles, depending on use.

Brake Fluid

All 2019 Tahoes use DOT 3 brake fluid. It is important to use fluid from a sealed container to avoid moisture contamination, which can lower the boiling point of the fluid and lead to brake fade. The brake system should be bled and the fluid replaced every 2-3 years, regardless of mileage. The system should be topped off as needed, but a significant drop in fluid level may indicate worn brake pads or a leak in the system.

Power Steering Fluid

The 2019 Tahoe uses a specific ACDelco Power Steering Fluid. Do not use automatic transmission fluid or "universal" power steering fluids, as they may not be compatible with the seals and components in the GM system. The fluid level should be checked at every oil change and topped off as needed.

Windshield Washer Fluid

Use any good quality windshield washer solvent. The reservoir holds approximately 1.0 gallon (3.8 liters).

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