2023 Chevrolet Suburban Fluid Type Specs

Quick reference

Fluid	Type/Spec	Capacity (approximate)
Engine Oil	SAE 0W-20, Dexos1 Gen3	8 quarts
Engine Coolant	Dex-Cool (Orange), OAT	16.9 quarts
Transmission Fluid (10AT)	Dexron ULV	13.5 quarts
Transfer Case (AWD Models)	Dexron ULV	1.6 quarts
Front Differential	SAE 75W-85, Dexron LS 75W-90	1.7 quarts
Rear Differential	SAE 75W-85, Dexron LS 75W-90	2.5 quarts
Brake Fluid	DOT 3 or DOT 4	1 quart
Power Steering Fluid	Electronically Assisted (EPAS)	N/A
Washer Fluid	GM Optikleen or equivalent	1 gallon
DEF (Diesel Models)	ISO 22241 (API DEF)	7 gallons (approx)

Engine Oil

For the 2023 Chevrolet Suburban, both the 5.3L V8, 6.2L V8, and 3.0L Duramax Turbo-Diesel engines require specific engine oils to ensure optimal performance and longevity.

For the gasoline engines (5.3L and 6.2L V8), the factory recommendation is SAE 0W-20 engine oil that meets the Dexos1 Gen3 specification. This specification is crucial as it ensures the oil meets General Motors' stringent requirements for fuel economy, engine protection, and emissions system compatibility. Using an oil that does not meet the Dexos1 Gen3 standard can lead to premature engine wear, reduced fuel efficiency, and may even void your powertrain warranty. The typical capacity for an oil change, including filter, is approximately 8 quarts.

For the 3.0L Duramax Turbo-Diesel engine, the specific requirement is SAE 0W-20 engine oil that meets the DexosD specification. DexosD is designed for GM's diesel engines and provides enhanced protection against oxidation, wear, and sludge formation common in modern diesel engines. Always verify the DexosD certification on the oil bottle. The diesel engine oil capacity is approximately 7 quarts.

Intervals: Generally, the engine oil and filter should be changed every 7,500 miles or as indicated by the vehicle's Oil Life Monitoring system, whichever comes first. For vehicles subjected to heavy-duty use (towing, extreme temperatures, dusty conditions), more frequent changes may be necessary. Always consult your owner's manual for the most accurate service intervals.

Pitfalls: Never use conventional or non-Dexos approved oils. The advanced engineering of these engines relies on the specific properties of Dexos-certified oils. Failing to do so can lead to timing chain stretch, premature wear, and costly repairs.

Engine Coolant

The 2023 Chevrolet Suburban uses Dex-Cool extended-life engine coolant, which is an Organic Acid Technology (OAT) coolant. It is typically orange in color. This coolant is designed for long-lasting corrosion protection for aluminum and other engine metals. The approximate capacity is 16.9 quarts.

Intervals: Dex-Cool has a service life of up to 5 years or 150,000 miles, whichever comes first. However, it's good practice to have its condition checked periodically by a qualified technician.

Pitfalls: Never mix Dex-Cool with conventional green or yellow coolants, or coolants that are not OAT-based. Mixing different coolant types can lead to chemical reactions that form sludge and deposits, clogging the cooling system and causing severe engine damage. If a top-off is needed, always use Dex-Cool or a compatible OAT coolant. Ensure your coolant is not contaminated.

Transmission Fluid

The 2023 Chevrolet Suburban typically comes with a 10-speed automatic transmission. This transmission requires Dexron ULV (Ultra Low Viscosity) automatic transmission fluid. This is a highly specialized fluid designed for modern, fuel-efficient transmissions with tight tolerances. The approximate capacity is 13.5 quarts for a complete refill, though a drain and fill will take less.

Intervals: Under normal driving conditions, the transmission fluid is often considered "filled for life" or has very long service intervals (e.g., 100,000 miles or more). However, for vehicles used for heavy towing, frequent stop-and-go driving, or in hot climates, it is advisable to consider more frequent fluid and filter changes. Always refer to your owner's manual or OEM service information for precise intervals.

Pitfalls: Never use universal ATF or Dexron VI/III/II. Dexron ULV is a unique and critical specification. Using the wrong fluid can lead to transmission shudder, erratic shifting, overheating, and ultimately, catastrophic transmission failure. Always consult the owner's manual for the exact fluid type and specification.

Transfer Case (AWD/4WD Models)

For 2023 Chevrolet Suburban models equipped with all-wheel drive or four-wheel drive, the transfer case typically requires Dexron ULV automatic transmission fluid same as the transmission. The capacity is approximately 1.6 quarts.

Intervals: Check your owner's manual for specific maintenance intervals, but typically, transfer case fluid should be inspected and potentially changed every 50,000 to 100,000 miles, especially if used for off-road driving or heavy towing.

Pitfalls: As with the transmission, ensure you use the correct Dexron ULV fluid. Incorrect fluid can lead to premature wear and failure of the transfer case components.

Front and Rear Differential

Both the front and rear differentials on the 2023 Chevrolet Suburban typically require SAE 75W-85 gear oil that meets the Dexron LS 75W-90 specification. While a 75W-85 weight, the Dexron LS 75W-90 spec indicates it