2021 GMC Yukon Fluid Type Specs
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
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Quick Reference
| Fluid | Type/Spec | Capacity (approximate) |
|---|---|---|
| Engine Oil | SAE 0W-20, dexos1 Gen2 (or newer dexos1 Gen3) | 8.0 quarts (6.2L/5.3L V8), 7.0 quarts (3.0L Duramax) |
| Engine Coolant | DEX-COOL Antifreeze/Coolant (GM spec 6277M long-life OAT) | 16-17 quarts |
| Transmission Fluid | DEXRON ULV (GM 10L80/10L90) | 10.0 - 12.0 quarts |
| Transfer Case Fluid | AutoTrak II or DEXRON HP | 1.5 - 2.0 quarts |
| Front Differential | SAE 75W-90, GM part no. 88901765 (for electronic limited slip) | 1.5 - 2.0 quarts |
| Rear Differential | SAE 75W-90, GM part no. 88901765 (for electronic limited slip) | 2.5 - 3.0 quarts |
| Brake Fluid | DOT 3 or DOT 4 (recommended for optimal performance) | As needed |
| Power Steering Fluid | Not applicable (electric power steering) | N/A |
| Windshield Washer Fluid | All-season washer fluid | As needed |
| Diesel Exhaust Fluid (DEF) | ISO 22241 (for 3.0L Duramax diesel) | 5.0 gallons |
Engine Oil
The 2021 GMC Yukon offers a choice of three engines: the 5.3L V8, 6.2L V8, and the 3.0L Duramax Turbo-Diesel. Each requires specific engine oil to ensure optimal performance and longevity.
For the 5.3L and 6.2L V8 gasoline engines, the factory fill is SAE 0W-20 engine oil meeting the GM dexos1 Gen2 specification or the newer, backward-compatible dexos1 Gen3 specification. Always look for the official dexos1 licensed mark on the oil container. Using oil that does not meet this specification can lead to engine wear, reduced fuel economy, and potential warranty issues. The oil capacity for these engines is approximately 8.0 quarts.
For the 3.0L Duramax Turbo-Diesel engine, the specified oil is SAE 0W-20 meeting the GM dexosD specification. This is a specific diesel engine oil designed for the unique needs of modern diesel engines, including those with diesel particulate filters (DPFs). The oil capacity for the 3.0L Duramax is approximately 7.0 quarts.
Maintenance Interval: General Motors recommends an Oil Life Monitoring (OLM) system for determining oil change intervals. This system takes into account driving conditions, temperatures, and engine revolutions. Typically, oil changes will be recommended between 7,500 and 10,000 miles or once a year, whichever comes first. Always adhere to the OLM system or your owner
More specs for the 2021 GMC Yukon
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2021 GMC Yukon Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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