2015 Chevrolet Equinox — Complete Fluid Type Specifications

As an ASE-certified master technician, I regularly see vehicles come into the shop with premature wear or catastrophic failures caused by one simple mistake: using the wrong fluids. The 2015 Chevrolet Equinox is a reliable crossover when maintained correctly, but like all modern GM vehicles, its longevity relies heavily on exact fluid chemistry. Whether you have the 2.4L Ecotec inline-four or the 3.6L V6, getting the specs right is crucial.

Below is your complete guide to the factory-specified fluids for the 2015 Chevrolet Equinox.

Quick reference

Fluid	Type/Spec	Capacity
Engine Oil (2.4L I4)	SAE 5W-30, GM dexos1™ Gen 3 (API SP)	5.0 qts (4.7 L) with filter
Engine Oil (3.6L V6)	SAE 5W-30, GM dexos1™ Gen 3 (API SP)	6.0 qts (5.7 L) with filter
Engine Coolant	DEX-COOL® (OAT), GM 6277M	2.4L: 8.3 qts / 3.6L: 10.4 qts
Automatic Transmission	DEXRON®-VI ATF	~5.3 - 6.3 qts (Drain & Refill)*
Transfer Case (AWD)	SAE 75W-90 API GL-5 Gear Oil	0.8 qts (0.8 L)
Rear Differential (AWD)	SAE 75W-90 API GL-5 Gear Oil	0.8 qts (0.8 L)
Brake Fluid	DOT 3 Hydraulic Brake Fluid	Fill to MAX line
Power Steering (2.4L)	N/A (Electric Power Steering)	N/A
Power Steering (3.6L)	GM Power Steering Fluid or DEXRON®-VI	Fill to cold/hot mark
Washer Fluid	Optikleen® or standard washer solvent	~1.0 Gallon

*Note: Always verify exact capacities in your owner's manual or OEM service info. Transmission total overhaul capacity is higher (approx. 9.0–9.5 qts).

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Engine Oil

For both the 2.4L I4 and the 3.6L V6, General Motors requires SAE 5W-30 full synthetic engine oil that carries the dexos1™ certification.

Technician Notes & Pitfalls: While the 2015 manual originally specified dexos1 Gen 1, GM has since superseded this standard. You should be using dexos1™ Gen 3 (which also meets API SP standards). This newer formulation is designed specifically to prevent Low-Speed Pre-Ignition (LSPI) and mitigate timing chain wear—a known vulnerability in both the 2.4L Ecotec and the 3.6L V6. Do not skip oil changes or use conventional oil. The Variable Valve Timing (VVT) actuators in these engines use oil pressure to adjust timing. Dirty or degraded oil will clog the microscopic screens on the VVT solenoids, leading to rough idling, stalling, and dreaded timing chain stretch. Stick to 5,000-mile intervals regardless of what the dash oil life monitor indicates.

Engine Coolant

The only acceptable coolant for the 2015 Equinox is DEX-COOL®, which is an Organic Acid Technology (OAT) antifreeze. It is typically orange in color and conforms to the GM 6277M specification.

Technician Notes & Pitfalls: Never mix DEX-COOL with traditional green conventional (Inorganic Additive Technology - IAT) or yellow universal (HOAT) coolants. Mixing OAT with other formulas causes a chemical reaction that creates a thick, gelatinous sludge. This sludge will clog your heater core (leading to no cabin heat) and block the radiator, eventually causing catastrophic engine overheating. Always use a 50/50 mix of DEX-COOL and distilled water. The system should be flushed every 5 years or 150,000 miles, but inspecting it at 100,000 miles is best practice.

Automatic Transmission Fluid (ATF)

Your Equinox uses a 6-speed automatic transmission (the 6T45 or 6T70 depending on engine). The factory specification for the fluid is strictly DEXRON®-VI.

Technician Notes & Pitfalls: DEXRON-VI is a highly refined, low-viscosity synthetic fluid. Do not use older DEXRON-III, and stay far away from "Universal" or "Multi-Vehicle" ATF off the parts store shelf unless it explicitly states it is licensed for DEXRON-VI. The internal clutch packs and torque converter slip rates are calibrated specifically for the frictional properties of DEXRON-VI. Using the wrong fluid will cause harsh shifts, torque converter shudder, and eventual transmission failure. A drain and fill every 45,000 to 50,000 miles is highly recommended to prolong the life of the 6T transmission family.

Transfer Case & Rear Differential (AWD Models Only)

If your 2015 Equinox is equipped with All-Wheel Drive (AWD), you have a transfer case (power transfer unit) up front and a rear differential in the back. Both units require SAE 75W-90 API GL-5 Gear Oil.

Technician Notes & Pitfalls: These units only hold a small amount of fluid (about 0.8 quarts each), which means the fluid works extremely hard and breaks down faster than in larger truck differentials. Neglecting these fluids is the number one cause of whining noises from the rear end or binding up front. Since it uses a standard open differential setup, no Limited Slip (LSD) friction modifier additive is required. Change both fluids every 45,000 miles under normal conditions, or sooner if you frequently tow or live in harsh climates.

Brake Fluid

The braking system requires standard DOT 3 Hydraulic Brake Fluid.

Technician Notes & Pitfalls: Brake fluid is hygroscopic, meaning it absorbs moisture from the air over time. Once the water content exceeds about 3%, the boiling point of the fluid drops drastically, leading to a spongy brake pedal and reduced stopping power during heavy braking. Moisture also corrodes the expensive internal valves of the ABS module. Flush the brake system completely every 2 to 3 years. You can safely use DOT 4 if DOT 3 is unavailable, as they are compatible, but never use silicone-based DOT 5.

Power Steering Fluid

This is an area that catches many DIYers and even inexperienced techs off guard, as it varies by engine:

• 2.4L I4 Models: These are equipped with Electric Power Steering (EPS). There is no power steering pump, no lines, and no fluid to check or change.
• 3.6L V6 Models: These use a traditional hydraulic power steering system. The factory specification calls for GM Power Steering Fluid (GM Part No. 89021184) or DEXRON®-VI ATF.

Technician Notes & Pitfalls: For the V6, keeping the hydraulic fluid clean is critical for the longevity of the pump and steering rack. If the fluid smells burnt or looks dark brown/black, use a turkey baster to extract the old fluid from the reservoir and top it off with fresh DEXRON-VI or GM PS fluid. Repeat this a few times over a week of driving to effectively refresh the system.

Washer Fluid

Top off the reservoir with standard automotive windshield washer fluid. If you live in an area that sees freezing temperatures, ensure the fluid is rated for below-freezing weather to prevent the reservoir and lines from cracking.

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Maintaining the factory-spec fluids in your 2015 Chevrolet Equinox is the cheapest insurance policy you can buy. When in doubt, always refer to your specific owner's manual or consult the GM service information for your exact VIN.

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