2024 GMC Yukon Fluid Specifications & Capacities

As an ASE-certified master technician, I regularly see modern SUVs like the 2024 GMC Yukon roll into the bay for routine maintenance. The current generation Yukon is a highly sophisticated machine, offered with two potent gasoline V8s (5.3L and 6.2L) and an incredibly efficient 3.0L Duramax inline-six turbodiesel. Keeping these powertrains running at their peak requires strict adherence to General Motors’ factory fluid specifications.

Using the wrong fluid in a modern 10-speed transmission or a tight-tolerance Duramax engine isn't just a minor mistake; it can lead to catastrophic component failure and void your warranty. Below is the comprehensive fluid specification guide for the 2024 GMC Yukon.

Quick reference

Note: Capacities are approximate dry fill or service fill estimates. Always verify exact capacities in your owner’s manual or OEM service information, and check the dipstick/level plug to confirm proper fill levels.

Fluid	Type/Spec	Capacity
Engine Oil (5.3L & 6.2L V8)	0W-20 GM dexos1 Gen3 (API SP)	8.0 qts (7.6L) with filter
Engine Oil (3.0L Duramax Diesel)	0W-20 GM dexosD	7.0 qts (6.6L) with filter
Engine Coolant	GM Dex-Cool (OAT, Orange/Pink)	14.5 - 18.2 qts (varies by engine)
Transmission Fluid (10-speed)	GM DEXRON ULV ATF	7-8 qts (service pan drop) / ~13 qts total
Transfer Case (4WD)	GM Auto-Trak II or DEXRON VI (Check RPO)	1.6 qts (1.5L)
Front Differential (4WD)	75W-90 Synthetic Gear Oil (GM Spec)	1.1 qts (1.0L)
Rear Differential	75W-90 Synthetic Gear Oil (GM Spec)	1.6 - 1.7 qts (1.5 - 1.6L)
Brake Fluid	DOT 4 Hydraulic Brake Fluid	Fill to MAX line
Power Steering Fluid	N/A (Electric Power Steering)	N/A
Diesel Exhaust Fluid (DEF)	API Certified ISO 22241	~5.0 gallons
Windshield Washer Fluid	GM Optikleen or standard winter-mix	Fill reservoir

Engine Oil

5.3L and 6.2L Gas V8 Engines

General Motors specifies 0W-20 weight oil meeting the GM dexos1 Gen3 standard. The Gen3 specification is critical because it addresses Low-Speed Pre-Ignition (LSPI) protection, timing chain wear, and turbocharger deposit control (even though the Yukon V8s are naturally aspirated, the standard remains). If you cannot find dexos1 Gen3, an oil meeting API SP and ILSAC GF-6A is acceptable for top-offs, but you should stick to the dexos spec for full changes. Interval: Follow the Oil Life Monitor (OLM). As a master tech, I strongly advise not exceeding 5,000 to 7,500 miles, especially if you tow or idle frequently.

3.0L Duramax Diesel (LM2/LZ0)

The 3.0L Duramax requires a specialized light-duty diesel oil: 0W-20 meeting the GM dexosD specification. Common Pitfall: Do not use heavy-duty diesel oils like 15W-40 CK-4 in this engine. The oil pump and tight bearing clearances are designed specifically for the ultra-low viscosity dexosD fluid. Using the wrong oil can trigger oil pressure codes and damage the variable flow oil pump.

Engine Coolant

All 2024 GMC Yukons use GM Dex-Cool, which is an Organic Acid Technology (OAT) coolant. It is typically orange or pink in color. Common Pitfall: Never mix Dex-Cool with traditional green Inorganic Acid Technology (IAT) coolant or yellow Hybrid Organic Acid Technology (HOAT) fluids. Mixing fluid types will cause the silicates/phosphates to precipitate and form a thick, muddy sludge that clogs the heater core and radiator. Replace the coolant every 5 years or 150,000 miles, whichever comes first.

Transmission Fluid

The 10-speed automatic transmission (10L80/10L90) requires GM DEXRON ULV (Ultra-Low Viscosity) automatic transmission fluid. Common Pitfall: Do not use standard DEXRON VI or universal multi-vehicle ATF. The 10-speed operates with extremely tight clutch clearances and relies on the ultra-low viscosity to maintain hydraulic pressure and fuel economy. Using older, thicker ATF will result in harsh shifting, overheating, and premature clutch pack failure.

Transfer Case (4WD Models)

Depending on the specific transfer case your Yukon is equipped with (single-speed vs. two-speed active), you will either need GM Auto-Trak II (recognizable by its distinct blue color) or DEXRON VI ATF. Check your specific RPO code or owner’s manual. Using standard gear oil or the wrong ATF will ruin the internal clutches on the active transfer cases, resulting in four-wheel-drive engagement shudder.

Front and Rear Differentials

Both the front and rear differentials call for 75W-90 Synthetic Gear Oil. Note on Limited Slip: Many Yukon models feature an electronic limited-slip differential (eLSD) or a mechanical locking differential (G80). The modern GM synthetic 75W-90 gear oil typically already contains the necessary friction modifiers. Avoid adding aftermarket LSD additives unless explicitly directed by a GM Technical Service Bulletin, as excessive friction modifier can prevent the locker from engaging properly.

Brake Fluid

GM requires DOT 4 Hydraulic Brake Fluid for the 2024 Yukon. DOT 4 has a higher boiling point than older DOT 3 fluids, which is essential for a heavy SUV that might be towing a 8,000-pound trailer. Maintenance note: Brake fluid is hygroscopic (absorbs moisture from the air). Flush and replace the brake fluid every 3 to 5 years, or if the copper content/moisture levels test out of spec. Never use silicone-based DOT 5 fluid, as it will destroy the ABS module seals.

Power Steering Fluid

The 2024 GMC Yukon utilizes an Electric Power Steering (EPS) rack. There is no power steering fluid to check, top off, or leak. The system is entirely electro-mechanical.

Diesel Exhaust Fluid (DEF)

For the 3.0L Duramax models, you must use Diesel Exhaust Fluid (DEF) that meets API certification and ISO 22241 standards. Common Pitfall: DEF degrades when exposed to extreme heat or sunlight. Always buy fresh DEF (check the date codes on the box) and never put DEF into the diesel fuel tank. Contaminated DEF will quickly trigger a "Speed Limited" countdown and require costly repairs to the selective catalytic reduction (SCR) system.

Windshield Washer Fluid

Use standard washer fluid or GM Optikleen. In freezing climates, ensure you are using a winter-grade fluid rated for -20°F or lower to prevent the fluid from expanding and cracking the reservoir or pump.

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Modern vehicles demand precision. When in doubt about a specific RPO code or sub-model requirement, always consult your owner's manual or OEM service info. Find a trusted shop on Repairius.