2023 Chevrolet Silverado 1500: Complete Fluid Specifications

As an ASE-certified master technician, I know that using the correct fluids is the single most important thing you can do to ensure the longevity and reliability of your truck. Modern vehicles, like the 2023 Chevrolet Silverado 1500, are built with tighter tolerances and more complex systems than ever before. Using a "universal" or "multi-vehicle" fluid can lead to premature wear, poor performance, and even catastrophic failure.

This guide details the specific, factory-recommended fluids and capacities for your 2023 Silverado 1500. Always trust the manufacturer's specification over a generic recommendation from a parts store.

Quick Reference: 2023 Silverado 1500 Fluid Specs

Fluid	Type/Specification	Capacity
Engine Oil (2.7L L3B)	SAE 0W-20 API SP / dexos1 Gen 3	6.0 quarts / 5.7 liters
Engine Oil (5.3L L84 & 6.2L L87)	SAE 0W-20 API SP / dexos1 Gen 3	8.0 quarts / 7.6 liters
Engine Oil (3.0L LM2 Duramax)	SAE 0W-20 dexosD Licensed	7.0 quarts / 6.6 liters
Engine Coolant	ACDelco DEX-COOL (OAT) / GM 6277M	10.9 - 17.4 quarts (Varies by engine/cooling system)
Automatic Transmission Fluid (8-speed)	ACDelco DEXRON ULV	~10.0 quarts (Service Refill Varies)
Automatic Transmission Fluid (10-speed)	ACDelco DEXRON ULV	~12.2 quarts (Service Refill Varies)
Transfer Case Fluid (4WD)	ACDelco DEXRON VI	1.6 quarts / 1.5 liters
Front Differential Fluid	SAE 75W-85 GL-5 Gear Oil	1.1 quarts / 1.0 liter
Rear Differential Fluid	SAE 75W-85 GL-5 Gear Oil	2.75 quarts / 2.6 liters
Brake Fluid	DOT 3 Hydraulic Brake Fluid	Fill to "MAX" line
Diesel Exhaust Fluid (DEF)	API Certified ISO 22241	5.3 gallons / 20.0 liters
Windshield Washer Fluid	Good Quality Washer Fluid	~1 gallon / 4.0 liters

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Engine Oil

For the 2023 model year, Chevrolet specifies a synthetic SAE 0W-20 oil for all gasoline engines. However, the exact specification differs between the gas and diesel options.

• 2.7L L3B Turbo, 5.3L L84 V8, and 6.2L L87 V8: These engines require a SAE 0W-20 synthetic oil that is licensed and displays the GM dexos1 Gen 3 trademark. This is a critical specification; Gen 3 was developed to combat Low-Speed Pre-Ignition (LSPI) in modern turbocharged and direct-injection engines. It also provides enhanced protection against chain wear and improves oxidation and deposit control. Look for the dexos1 logo on the bottle.
• 3.0L LM2 Duramax Diesel: The "baby Duramax" has its own unique requirement: SAE 0W-20 that meets the GM dexosD specification. Do not use dexos1 or dexos2 oils in this engine. The dexosD formulation has a different additive package specifically designed for the needs and emissions systems of modern light-duty diesel engines.

Service Note: Oil and filter change intervals are determined by the Oil Life Monitoring (OLM) system. Do not exceed one year between changes, regardless of mileage. Always replace the oil filter with a quality unit (such as ACDelco) at every oil change.

Engine Coolant

The 2023 Silverado 1500 is factory-filled with ACDelco DEX-COOL Extended Life Antifreeze/Coolant. This is an Organic Acid Technology (OAT) coolant, easily identified by its orange color.

• Specification: GM 6277M
• Service Interval: 5 years or 150,000 miles (240,000 km).

Common Pitfall: Never mix coolants of different types. Do not add green, yellow, or purple coolant to the orange DEX-COOL system. Mixing a traditional Inorganic Acid Technology (IAT) or Hybrid OAT (HOAT) coolant with the factory OAT formula can cause the coolant to "gel," leading to blockages in the radiator, heater core, and cooling passages, which can cause severe engine overheating and damage.

Automatic Transmission Fluid

Chevrolet used two different automatic transmissions in the 2023 Silverado, and they use different fluids.

• 8-Speed Automatic (8L90): Requires ACDelco DEXRON ULV (Ultra-Low Viscosity) fluid. This is a specific, new-generation fluid and is not interchangeable with older DEXRON types.
• 10-Speed Automatic (10L80): Also requires ACDelco DEXRON ULV fluid.

Critical Note: Do not use DEXRON VI, DEXRON III, or any "universal" ATF in these transmissions. Using the wrong fluid will cause shift problems, accelerated wear, and eventual transmission failure. Transmission fluid and filter changes should be performed according to the maintenance schedule, typically around 45,000 miles for severe service or as indicated by the service manual for normal use.

Driveline Fluids (4WD)

Transfer Case

4WD models require ACDelco DEXRON VI (6) Automatic Transmission Fluid in the transfer case. Note that this is a different fluid from what the transmission itself uses. Using the wrong fluid can damage clutches and moving parts inside the transfer case.

Front & Rear Differentials

Both the front and rear axles use SAE 75W-85 GL-5 Axle Lubricant. Unlike some past models, a limited-slip additive is not typically required unless you have a specific locking differential (G80) that specifies it. The standard differentials do not require it. Always verify with your specific RPO codes if you are unsure.

Brake Fluid

All 2023 Silverado 1500 models use DOT 3 Motor Vehicle Brake Fluid. While DOT 4 and DOT 5.1 fluids have higher boiling points and are technically compatible in a fresh system, it is best practice to stick with the manufacturer's recommendation. Never use DOT 5 (silicone-based) fluid, as it is incompatible with the system's seals and will cause severe damage.

Service Note: Brake fluid is hygroscopic, meaning it absorbs moisture from the air. This moisture lowers the boiling point and can cause corrosion in the lines and ABS module. The fluid should be replaced every 2-3 years, regardless of mileage.

Diesel Exhaust Fluid (DEF) (3.0L Duramax)

If your Silverado is equipped with the 3.0L Duramax engine, it requires Diesel Exhaust Fluid (DEF) for its Selective Catalytic Reduction (SCR) emissions system. Use only high-quality DEF that is API Certified and meets ISO 22241. This is standard for all modern diesel vehicles and is available under many brand names. Do not put any additives in the DEF tank.

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Using the correct, OEM-spec fluid for every component is the best insurance policy for your truck. It guarantees performance as the engineers intended and prevents costly, avoidable repairs down the road.

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