2015 Chevrolet Silverado 3500HD Fluid Type Specs
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
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Quick reference
| Fluid | Type/Spec | Capacity |
|---|---|---|
| Engine Oil | SAE 5W-30, GM dexos1 (Gasoline) / SAE 15W-40 or 5W-40, API CJ-4 (Diesel) | Gasoline: ~6.0 quarts / Diesel: ~10.0 quarts |
| Engine Coolant | DEX-COOL Orange, GM Dex-Cool spec | ~17-25 quarts (system dependent) |
| Transmission Fluid | DEXRON VI Automatic Transmission Fluid | ~7.0-12.0 quarts (service dependent) |
| Transfer Case | AutoTrak II or DEXRON VI | ~1.5-2.0 quarts |
| Front Differential | SAE 75W-90 Synthetic Axle Lubricant, GM P/N 88900401 | ~1.8-2.0 quarts |
| Rear Differential | SAE 75W-90 Synthetic Axle Lubricant (with or without limited slip additive, depending on axle) | ~2.5-3.0 quarts |
| Brake Fluid | DOT 3 or DOT 4 Brake Fluid | As needed |
| Power Steering | DEXRON VI Automatic Transmission Fluid | As needed |
| Washer Fluid | General Purpose Windshield Washer Fluid | ~1 gallon |
| DEF (Diesel Exhaust Fluid) | ISO 22241 (API DEF) | ~7.0 gallons (Duramax) |
Engine Oil
For the 2015 Chevrolet Silverado 3500HD, engine oil specifications vary based on the engine installed.
-
6.0L Vortec V8 (Gasoline): The factory fill and recommended oil is SAE 5W-30 meeting the GM dexos1 specification. Look for the dexos1 Gen2 or Gen3 logo on the oil bottle. The typical oil capacity is approximately 6.0 quarts. It is crucial to use oil that meets the dexos1 specification to ensure proper engine lubrication, fuel economy, and emissions system performance. Refer to your owner's manual for the exact capacity for your specific engine configuration, as it can vary slightly.
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6.6L Duramax LML V8 (Diesel): For the Duramax diesel engine, the recommended engine oil is SAE 15W-40 meeting the API CJ-4 specification or newer (such as CK-4, if available and backward compatible, always verify). In colder climates or for improved cold starting, SAE 5W-40 API CJ-4 (or newer) can be used. Many Duramax owners prefer synthetic 5W-40 for its benefits in extreme temperatures. The approximate oil capacity for the Duramax is around 10.0 quarts. Always check the dipstick and owner's manual for precise filling instructions and capacity.
Intervals and Pitfalls: Engine oil and filter should be changed according to the Oil Life Monitoring (OLM) system in gasoline engines, typically every 7,500-10,000 miles or annually, whichever comes first. For diesel engines, the interval is often around 7,500 miles, but always follow the OLM or manufacturer's severe duty recommendations if towing/hauling frequently. Using non-dexos1 oil in gasoline engines or incorrect API spec oil in diesel engines can lead to premature wear, reduced fuel economy, and potential warranty issues.
Engine Coolant
Your 2015 Chevrolet Silverado 3500HD uses DEX-COOL extended-life engine coolant, which is typically orange in color. This is an Organic Acid Technology (OAT) coolant designed for long-term protection against corrosion and freezing. The specific GM specification for this coolant is simply
More specs for the 2015 Chevrolet Silverado 3500HD
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
2014 Silverado 3500HD
2016 Silverado 3500HD
2017 Silverado 3500HD
2018 Silverado 3500HD
2019 Silverado 3500HD
2020 Silverado 3500HD
Maintenance & repair guides
2015 Chevrolet Silverado 3500HD Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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