2014 GMC Sierra 1500 Fluid Type Specs

Quick Reference

Fluid	Type/Spec	Capacity
Engine Oil	ACDelco dexos1 Gen2 SAE 5W-30	6.0 - 8.0 quarts (depending on engine)
Engine Coolant	DEX-COOL Extended Life (GM Spec 6277M)	16.3 quarts (approx. system capacity)
Transmission Fluid	DEXRON-VI Automatic Transmission Fluid	11.4 quarts (6L80/6L90, total dry fill)
Transfer Case Fluid	AutoTrak II (GM Spec 9986161)	1.5 - 2.0 quarts
Front Differential Fluid	SAE 75W-90 Synthetic Axle Lubricant (GM Spec 9986115)	1.7 - 1.8 quarts
Rear Differential Fluid	SAE 75W-90 Synthetic Axle Lubricant (GM Spec 9986115); for Locking Differential add GM friction modifier	2.2 - 2.6 quarts
Brake Fluid	DOT 3 or DOT 4	As needed
Power Steering Fluid	DEXRON-VI Automatic Transmission Fluid	As needed
Washer Fluid	Windshield Washer Solvent	1 gallon (approx.)

Engine Oil

For your 2014 GMC Sierra 1500, the factory-specified engine oil is SAE 5W-30 meeting the ACDelco dexos1 Gen2 specification. It's crucial to use a dexos1 Gen2 approved oil as it's formulated to protect against low-speed pre-ignition (LSPI) and provides superior fuel economy and wear protection. For gasoline engines, capacities typically range from 6.0 to 8.0 quarts depending on the specific engine (e.g., 4.3L V6, 5.3L V8, 6.2L V8). Always verify the exact capacity in your owner's manual. Adherence to dexos1 Gen2 is paramount, as using non-dexos1 oils can lead to engine damage and may void your warranty. The oil change interval is typically indicated by the vehicle's Oil Life Monitoring System, but a good rule of thumb is every 7,500 miles or 12 months, whichever comes first, under normal driving conditions. For severe duty, this interval may be shortened.

Engine Coolant

The 2014 GMC Sierra 1500 utilizes DEX-COOL Extended Life Antifreeze/Coolant. This is an Organic Acid Technology (OAT) coolant, easily identified by its orange/red color. It meets GM Specification 6277M. Never mix DEX-COOL with conventional green coolants (Inorganic Acid Technology - IAT) or Hybrid Organic Acid Technology (HOAT) coolants, as this can lead to gel formation, corrosion, and severe damage to your cooling system components. The total system capacity is approximately 16.3 quarts. The recommended service interval for DEX-COOL is typically 5 years or 150,000 miles, whichever comes first, though it's always wise to inspect the coolant level and condition periodically. Pay attention to any color changes or debris, which could indicate a problem.

Transmission Fluid

Your 2014 GMC Sierra 1500, equipped with the 6L80 or 6L90 automatic transmission, requires DEXRON-VI Automatic Transmission Fluid. DEXRON-VI is a synthetic blend fluid designed for improved durability, wear protection, and consistent shift performance, even at extreme temperatures. Do not use older DEXRON specifications (e.g., DEXRON-III) as they do not meet the performance requirements of modern GM transmissions. The total dry fill capacity for the 6L80/6L90 is around 11.4 quarts, though a routine drain and fill will only replace a fraction of this. Transmission fluid service intervals can vary; consult your owner's manual. For heavy towing or frequent off-road use, more frequent fluid and filter changes are recommended.

Transfer Case Fluid

For 4WD/AWD models of the 2014 GMC Sierra 1500, the transfer case requires AutoTrak II Fluid, which meets GM Specification 9986161. This is a specialized blue-colored fluid specifically formulated for GM's electronically controlled transfer cases. Using any other fluid can lead to premature wear and damage to the transfer case. Capacity is typically between 1.5 and 2.0 quarts. The service interval for transfer case fluid is generally every 50,000 miles or 5 years, though this can be reduced if the vehicle is frequently used for towing or off-road activities.

Differential Fluid (Front and Rear)

Both the front and rear differentials on your 2014 GMC Sierra 1500 use SAE 75W-90 Synthetic Axle Lubricant meeting GM Specification 9986115. This synthetic gear oil provides excellent wear protection and thermal stability. The front differential capacity is generally between 1.7 and 1.8 quarts. For the rear differential, capacity is around 2.2 to 2.6 quarts.

Important Note for Locking Differentials: If your Sierra 1500 is equipped with a locking rear differential (often denoted by a G80 RPO code), you must add a GM friction modifier additive (GM Part #88900330 or equivalent) to the SAE 75W-90 gear oil. Failing to do so will result in chatter and noise from the differential, particularly during turns. Always verify if your truck has a locking differential. The differential fluid service interval is typically every 50,000 miles or 5 years, or more frequently if operating under severe conditions like heavy towing.

Brake Fluid

The 2014 GMC Sierra 1500 uses either DOT 3 or DOT 4 brake fluid. These are glycol-ether based fluids and are compatible with each other, though DOT 4 has a higher wet and dry boiling point, offering better performance, especially under heavy braking conditions. Never use DOT 5 (silicone-based) brake fluid, as it is not compatible with brake systems designed for DOT 3 or DOT 4 and can cause significant damage. Brake fluid is hygroscopic, meaning it absorbs moisture over time, which lowers its boiling point and can lead to corrosion in the brake system. It is generally recommended to flush and replace the brake fluid every 2-3 years, regardless of mileage.

Power Steering Fluid

Interestingly, the 2014 GMC Sierra 1500 power steering system typically uses DEXRON-VI Automatic Transmission Fluid. This is the same fluid used in the automatic transmission. Always verify this in your owner's manual. Do not use generic power steering fluid unless explicitly specified as compatible with DEXRON-VI systems. Check the power steering fluid level periodically and address any leaks promptly. There isn't a universally prescribed flush interval, but if the fluid appears dark or smells burnt, it's a good idea to have it changed.

Washer Fluid

Any commercially available windshield washer solvent is suitable for your 2014 GMC Sierra 1500. It's advisable to use a washer fluid that offers freeze protection appropriate for your climate to prevent the fluid from freezing in the reservoir and lines during cold weather. Capacity is approximately 1 gallon. There is no specific service interval; simply refill as needed.

Diesel Exhaust Fluid (DEF)

This fluid is not applicable to the 2014 GMC Sierra 1500, as this model year for the 1500 series trucks was offered with gasoline engines only. DEF is exclusively used in diesel engines equipped with Selective Catalytic Reduction (SCR) systems to reduce NOx emissions. If you owned a heavy-duty Sierra (2500HD/3500HD) of the same year with a Duramax diesel engine, then you would need DEF meeting ISO 22241 (often branded as AdBlue).

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