2016 GMC Sierra 1500 Complete Fluid Specs & Capacities Guide

As an ASE-certified master technician, I’ve seen my fair share of premature failures on modern trucks simply because the wrong fluid was poured into the wrong hole. The 2016 GMC Sierra 1500 is a fantastic, hard-working truck, but its advanced powertrains—from the EcoTec3 V8s to the 8-speed transmissions—demand strict adherence to General Motors’ factory specifications. Using a “universal” fluid off the shelf is a surefire way to void your warranty or cause thousands of dollars in damage.

Below is the definitive, factory-spec fluid guide for the 2016 GMC Sierra 1500, compiled to help DIYers and service professionals keep these trucks on the road for the long haul.

Quick reference

Fluid	Type/Spec	Capacity
Engine Oil (4.3L V6)	5W-30 Full Synthetic (GM dexos1™ Gen 3)	6.0 quarts (5.7L) w/ filter
Engine Oil (5.3L & 6.2L V8)	0W-20 Full Synthetic (GM dexos1™ Gen 3)	8.0 quarts (7.6L) w/ filter
Engine Coolant	DEX-COOL® (OAT, Orange), GM 6277M	15.7 - 17.4 quarts (verify in manual)
Transmission (6-Speed)	DEXRON®-VI ATF	~12.4 qts total (approx 6 qts pan drop)
Transmission (8-Speed)	DEXRON®-HP ATF	~11.6 qts total (approx 7 qts pan drop)
Transfer Case (4WD)	DEXRON®-VI ATF	1.6 quarts (1.5L)
Front Differential (4WD)	80W-90 Gear Oil	1.6 quarts (1.5L)
Rear Differential	75W-85 Synthetic Axle Lubricant	2.7 - 2.8 quarts (2.6L)
Brake Fluid	DOT 3 Hydraulic Brake Fluid	Fill to MAX line
Power Steering	N/A (Electric Power Steering)	N/A
Washer Fluid	Optikleen® or standard washer solvent	Fill to top
DEF (Diesel Exhaust Fluid)	N/A (No diesel option in 2016 1500)	N/A

Note: Always verify capacities with the physical dipstick or fill-hole level check. Exact dry-fill vs. service-fill capacities can vary based on installed cooling packages (like max trailering).

Engine Oil

For the 2016 GMC Sierra 1500, oil weight depends heavily on the engine option. The 4.3L EcoTec3 V6 requires 5W-30, whereas the 5.3L and 6.2L V8s require 0W-20.

The Spec: General Motors originally specified dexos1 Gen 1 or Gen 2 for this model year. However, GM has superseded this with dexos1™ Gen 3. Always look for the green dexos1 Gen 3 badge on the bottle. This updated formulation offers superior protection against Low-Speed Pre-Ignition (LSPI) and better oxidation resistance.

Intervals & Pitfalls: While the GM Oil Life Monitor (OLM) is smart, I highly recommend changing your oil every 5,000 to 7,500 miles, especially if you tow or idle frequently. The EcoTec3 engines utilize Active Fuel Management (AFM), which relies on specialized hydraulic lifters. Dirty, degraded oil is the number one cause of AFM lifter failure—a very costly repair.

Engine Coolant

The Spec: You must use DEX-COOL®, which is an Organic Acid Technology (OAT) coolant. It is distinctly orange and carries the GM 6277M spec.

Intervals & Pitfalls: Dex-Cool is rated for 5 years or 150,000 miles. Never mix DEX-COOL with traditional green (Silicate-based) or yellow (HOAT) coolants. Mixing OAT with conventional coolants will cause the chemicals to react and form a thick, muddy sludge that clogs the heater core and radiator. If you are topping off, use a 50/50 pre-mixed Dex-Cool. If buying concentrate, mix it only with distilled water.

Transmission Fluid

The 2016 Sierra 1500 came with two different automatic transmissions, and this is where you need to pay close attention.

• 6-Speed Automatic (6L80): Requires standard DEXRON®-VI.
• 8-Speed Automatic (8L90): Requires DEXRON®-HP.

Intervals & Pitfalls: For the 6-speed, a fluid and filter change is recommended every 45,000 miles under severe duty (towing/city driving) or 97,500 miles normal duty. Never use a "universal ATF." For the 8-speed, many 2016 owners experienced a "shudder" issue. GM released a Technical Service Bulletin (TSB 18-NA-355) updating the fluid requirement to a specific Mobil 1 Synthetic LV ATF HP (blue label) to cure the torque converter shudder. If you have an 8-speed, confirm you are using the updated fluid formulation.

Transfer Case & Differentials

Four-wheel-drive Sierras require regular driveline maintenance that is often neglected until bearings start howling.

• Transfer Case: Uses DEXRON®-VI automatic transmission fluid. Do not use gear oil in the transfer case. Change every 45,000 miles if you frequently use 4WD or tow.
• Front Differential: Standard 80W-90 gear oil.
• Rear Differential: GM specifies a lightweight 75W-85 Synthetic Gear Oil for optimal fuel economy.

Intervals & Pitfalls: Change differential fluids every 45,000 miles. If your truck is equipped with the G80 automatic locking rear differential (the "Gov-Loc"), GM specifically states not to add friction modifiers or limited-slip additives. The G80 lockup mechanism relies on standard fluid friction to engage properly; adding a friction modifier will prevent the mechanical lock from engaging.

Brake Fluid

The Spec: Use a high-quality DOT 3 brake fluid.

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 internal ABS pump components. Flush the brake fluid every 2 to 3 years. Do not use DOT 5 (silicone-based) fluid, as it is incompatible with the truck's ABS system and will cause seal swelling and failure.

Power Steering, Washer Fluid & DEF

• Power Steering: The 2016 Sierra 1500 features Electric Power Steering (EPS). There is no hydraulic pump, no lines, and no fluid to check or change.
• Washer Fluid: Standard washer fluid (GM Optikleen or equivalent). Use a winter-rated solvent in freezing climates to prevent the reservoir from cracking.
• DEF (Diesel Exhaust Fluid): Not applicable. The 1500-series Sierra did not offer a diesel engine (like the 3.0L Duramax) in the 2016 model year.

Maintaining your 2016 GMC Sierra 1500 with the correct, factory-approved fluids is the cheapest insurance policy you can buy. If you don’t have the time, tools, or space to tackle these fluid flushes yourself, don't leave it to a quick-lube shop that might use generic fluids.

Find a trusted shop on Repairius.