2016 GMC Acadia Fluid Specifications Guide

As an ASE-certified master technician, I’ve serviced countless first-generation GM Lambda-platform SUVs. The 2016 GMC Acadia, equipped with the 3.6L V6 engine, is a robust family hauler that will easily push past 200,000 miles if properly maintained. The absolute key to that longevity is strictly adhering to General Motors' factory fluid specifications. Using universal fluids or guessing on viscosities is the quickest way to end up with timing chain wear, transmission shudder, or failed seals.

Below is your complete, comprehensive fluid specification guide for the 2016 GMC Acadia. Whether you have the Front-Wheel Drive (FWD) or All-Wheel Drive (AWD) configuration, this reference page gives you the exact OEM specifications, capacities, and maintenance pitfalls to watch out for.

Quick Reference

Note: All capacities are approximate. Always verify the fluid level with the dipstick or check plug after filling. Refer to your owner's manual or OEM service info for exact generation-dependent variations.

Fluid	Type/Spec	Capacity
Engine Oil	5W-30 Full Synthetic (GM dexos1™ Gen 3 / API SP)	5.5 Quarts (with filter)
Engine Coolant	DEX-COOL® (OAT, Orange) GM Spec 6277M	10.8 - 11.8 Quarts (varies by rear HVAC)
Transmission Fluid	DEXRON®-VI Automatic Transmission Fluid	5.3 Quarts (Drain & Refill) / 9.5 Qts (Dry)
Transfer Case (AWD)	75W-90 Synthetic Gear Oil (GM 88900401)	~1.0 Quart
Rear Differential (AWD)	75W-90 Synthetic Gear Oil (GM 88900401)	~0.8 Quart
Brake Fluid	DOT 3 Hydraulic Brake Fluid	Fill to MAX line
Power Steering Fluid	DEXRON®-VI ATF or GM Power Steering Fluid	Fill to Cold/Hot lines
Windshield Washer	Standard Washer Fluid	~1 Gallon
DEF (Diesel Exhaust)	N/A (Gasoline Engine Only)	N/A

Engine Oil Specifications

For the 3.6L V6 in the 2016 Acadia, GM requires 5W-30 viscosity engine oil that meets the dexos1™ specification. While the original 2016 manual called for dexos1 Gen 1 or Gen 2, GM has superseded this standard to dexos1 Gen 3 (and API SP).

• Capacity: 5.5 quarts with a filter change.
• Intervals & Pitfalls: The 3.6L V6 engine is notorious for timing chain stretching and actuator failures if oil changes are neglected or if inferior oil is used. I strongly advise against waiting for the Intelligent Oil-Life Monitor to hit 0%. Change your oil every 5,000 miles using full synthetic dexos1 Gen 3 oil. Never use conventional oil in this engine; it cannot withstand the thermal breakdown, leading to sludge that blocks the variable valve timing (VVT) solenoids.

Engine Coolant

The Acadia requires DEX-COOL® engine coolant (GM Spec 6277M). This is an Organic Acid Technology (OAT) coolant and is typically orange in color.

• Capacity: Varies from 10.8 to 11.8 quarts depending on whether your Acadia is equipped with rear climate control (which requires longer heater core lines).
• Intervals & Pitfalls: DEX-COOL is rated for 5 years or 150,000 miles, but in practice, draining and filling the radiator every 4 years or 50,000 miles keeps the system pristine. Never mix OAT (DEX-COOL) with HOAT (Hybrid OAT) or older green IAT (Inorganic Additive Technology) coolants. Mixing coolant types will cause the chemicals to react and form a thick, brown sludge that will clog your heater cores and radiator, leading to severe engine overheating. Always use a 50/50 mix with distilled water.

Automatic Transmission Fluid

The 6T75 6-speed automatic transmission strictly requires DEXRON®-VI Automatic Transmission Fluid.

• Capacity: A standard drain and refill will take about 5.3 quarts. A complete dry fill (if replacing the transmission or torque converter) takes about 9.5 quarts.
• Intervals & Pitfalls: Under "normal" driving conditions, GM states the fluid doesn't need frequent changing, but for "severe" duty, it's recommended every 45,000 miles. As an ASE master tech, I recommend a drain and fill every 45,000 to 50,000 miles for all drivers to prevent the notorious 3-5-R wave plate failures and torque converter shudder. Never use "universal" ATF or ATF+4/Mercon fluids. Stick to licensed DEXRON-VI.

Transfer Case and Rear Differential (AWD Models)

If your 2016 Acadia is equipped with All-Wheel Drive, you have a power transfer unit (PTU/transfer case) up front and a rear differential assembly. Both require 75W-90 Synthetic Gear Oil (GM Part No. 88900401 or equivalent GL-5 synthetic).

• Capacity: Transfer case is roughly 1.0 quart; rear diff is roughly 0.8 quart.
• Intervals & Pitfalls: The AWD system in the Acadia works hard. Change the fluid in both the PTU and rear differential every 45,000 miles to prevent bearing wear. No limited-slip additive (friction modifier) is required for these specific gearboxes, as the rear torque-biasing clutch pack is a sealed unit separate from the differential gear oil cavity.

Brake Fluid

General Motors specifies standard DOT 3 Hydraulic Brake Fluid for the 2016 Acadia.

• Intervals & Pitfalls: Brake fluid is hygroscopic, meaning it absorbs moisture from the air over time. This moisture lowers the boiling point of the fluid and corrodes ABS hydraulic control units from the inside out. Flush your brake fluid every 2 to 3 years. You can technically use DOT 4 as it is backward compatible with DOT 3 and has a higher boiling point, but never use DOT 5 (silicone-based), as it will destroy the seals in the ABS system.

Power Steering Fluid

For the hydraulic power steering system, GM specifies the use of DEXRON-VI Automatic Transmission Fluid or GM Power Steering Fluid.

• Intervals & Pitfalls: A common issue with the Lambda platform is a whining power steering pump and heavy steering at low speeds, often caused by fluid degradation or a restricted reservoir screen. Flushing the system with fresh DEXRON-VI every 50,000 miles keeps the pump quiet and extends the life of the steering rack.

Windshield Washer Fluid

Use standard automotive windshield washer fluid. In climates that experience freezing temperatures, ensure your washer fluid is rated for winter use (typically containing methanol) to prevent the fluid from freezing and cracking the washer fluid reservoir or lines.

Diesel Exhaust Fluid (DEF)

The 2016 GMC Acadia was only offered with the 3.6L gasoline V6. Therefore, no Diesel Exhaust Fluid (DEF) is required for this vehicle.

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Proper maintenance relies on using the right fluids at the right intervals. Don't compromise on OEM specifications, especially on a heavy, complex SUV like the Acadia.

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