2019 Chevrolet Suburban Complete Fluid Specifications

As an ASE-certified master technician, I see dozens of Chevrolet Suburbans roll through the bays every month. The 2019 Chevrolet Suburban—part of the highly popular GMT K2XX generation—is a robust family hauler and towing rig. Whether yours is equipped with the proven 5.3L V8 or the massive 6.2L V8, maximizing the lifespan of these powertrains comes down to one absolute rule: strict adherence to factory-specified fluids and maintenance intervals.

Using the wrong fluid in a modern GM vehicle can lead to catastrophic component failure, voided warranties, and massive repair bills. Below is your comprehensive guide to the exact fluids, specifications, and capacities required to keep your 2019 Suburban running like it just rolled off the assembly line in Arlington.

Quick Reference

Fluid	Type/Spec	Capacity
Engine Oil (5.3L & 6.2L V8)	SAE 0W-20 Full Synthetic (dexos1™ Gen 3 / API SP)	8.0 quarts (7.6 L) with filter
Engine Coolant	DEX-COOL® (OAT, Orange) GM Spec 6277M	16.7 - 17.4 quarts (verify options)
Transmission (6-Speed 6L80)	DEXRON®-VI ATF	Pan Drop: ~6.0 qts / Total: ~12.4 qts
Transmission (10-Speed 10L80)	DEXRON® ULV ATF	Pan Drop: ~7.4 qts / Total: ~13.1 qts
Transfer Case (4WD)	DEXRON®-VI ATF	~1.6 quarts (1.5 L)
Front Differential (4WD)	SAE 75W-90 Synthetic Gear Oil	~1.5 quarts (1.4 L)
Rear Differential	SAE 75W-85 Synthetic Gear Oil (GM 19300457)	~2.8 quarts (2.6 L)
Brake Fluid	DOT 3 Hydraulic Brake Fluid	Fill to MAX line
Power Steering	N/A (Electric Power Steering)	N/A
Washer Fluid	Standard Windshield Washer Solvent	~1 gallon
DEF	N/A (Gasoline engines only)	N/A

Note: Capacities are approximate. Always verify the exact level using the dipstick or check/fill plugs on a level surface. Check your owner's manual for specific trim configurations.

Engine Oil

For the 2019 Suburban, whether you have the 5.3L V8 (L83) or the 6.2L V8 (L86), GM strictly specifies SAE 0W-20 Full Synthetic engine oil. The capacity is a generous 8.0 quarts with a filter change.

The Spec: The oil must carry the dexos1™ certification. While the original 2019 specification called for dexos1 Gen 2, GM has since superseded this with the dexos1 Gen 3 standard, which offers improved oxidation resistance and better protection against Low-Speed Pre-Ignition (LSPI). Any oil meeting API SP / dexos1 Gen 3 is perfect.

Pitfalls & Intervals: Never substitute a heavier weight oil like 5W-30 simply because it's a "big V8." These engines utilize Variable Valve Timing (VVT) and Active Fuel Management (AFM), which rely on precise oil pressure and flow dynamics engineered around 0W-20. Relying purely on the Oil Life Monitor (OLM) can sometimes push intervals out to 7,500+ miles; as a master tech, I strongly advise 5,000-mile intervals to protect the sensitive AFM lifters from sludging and failure.

Engine Coolant

GM engines require DEX-COOL® engine coolant, an Organic Acid Technology (OAT) antifreeze. It is distinctively orange in color and meets GM specification 6277M.

Pitfalls & Intervals: The cardinal sin of GM cooling systems is mixing DEX-COOL with conventional green (IAT) or universal yellow/gold (HOAT) coolants. Mixing these chemical packages causes the coolant to gel and precipitate out, clogging the heater core and radiator. If you are topping off, ensure you are using a 50/50 premix of distilled water and genuine DEX-COOL. GM states the coolant is good for 5 years or 150,000 miles, but testing the pH and freeze point every 3 years or 50,000 miles is highly recommended.

Transmission Fluid

The 2019 Suburban was offered with two different transmissions, and they require completely different fluid specs:

1. 6-Speed Automatic (6L80): Typically mated to the 5.3L V8. Requires DEXRON®-VI.
2. 10-Speed Automatic (10L80): Typically mated to the 6.2L V8 (Premier Plus trim). Requires DEXRON® ULV (Ultra Low Viscosity).

Pitfalls & Intervals: Never use universal ATF, and absolutely do not mix DEXRON-VI with DEXRON ULV. ULV is significantly thinner to accommodate the tight tolerances and efficiency targets of the 10-speed gearbox; using standard DEX-VI in a 10-speed will cause erratic shifting and overheating. Furthermore, GM transmission thermal bypass valves are notorious for keeping fluid too hot; I recommend dropping the pan, changing the filter, and refilling every 45,000 to 60,000 miles for optimal longevity.

Transfer Case & Differentials (4WD Models)

For 4x4 models, your drivetrain fluids are just as critical as your engine oil.

• Transfer Case: Requires DEXRON®-VI automatic transmission fluid (roughly 1.6 quarts). GM transfer cases use internal clutches that require the specific friction modifiers present in DEX-VI.
• Front Differential: Requires SAE 75W-90 Synthetic Gear Oil.
• Rear Differential: Requires SAE 75W-85 Synthetic Gear Oil (GM part number 19300457 or equivalent).

Pitfalls & Intervals: The rear differential on the Suburban often houses an Eaton G80 automatic locking differential. Do not add limited-slip friction modifiers (LSD additives) to the rear diff; the G80 locker relies on metal-to-metal friction to engage, and additives will prevent it from locking properly. Plan on servicing the transfer case and differentials every 45,000 miles, or every 30,000 miles if you tow frequently.

Brake Fluid

The 2019 Suburban utilizes DOT 3 Hydraulic Brake Fluid. Ensure the fluid meets Delco Supreme 11 or equivalent standards.

Pitfalls & Intervals: DOT 3 fluid is highly hygroscopic (it absorbs moisture from the atmosphere). Over time, this lowers the boiling point of the fluid and can cause internal corrosion of the ABS module. Do not use DOT 5 (silicone-based) fluid, as it will destroy the seals in a DOT 3 system. Brake fluid should be flushed and bled every 2 to 3 years regardless of mileage.

Power Steering & Washer Fluid

• Power Steering: The 2019 Suburban is equipped with Electric Power Steering (EPS). There is no hydraulic pump, reservoir, or fluid to check or replace.
• Washer Fluid: Use standard windshield washer solvent. If you live in a cold climate, ensure you are using a winter-grade formula rated for sub-freezing temperatures to prevent the reservoir and lines from cracking.

Keep these specifications handy in your glovebox, and your 2019 Chevy Suburban will deliver hundreds of thousands of miles of reliable service.

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