2025 Kenworth T680 Fluid Type Specifications
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 (approximate) |
|---|---|---|
| Engine Oil | API CK-4, SAE 15W-40 | 40-48 quarts |
| Engine Coolant | Extended Life Coolant (ELC) | 60-70 quarts |
| Transmission Fluid | Eaton PS-386, API GL-4 | 14-18 quarts |
| Rear Differential | API GL-5, SAE 75W-90 | 18-22 pints (per axle) |
| Brake Fluid | DOT 4 | Verify in manual |
| Power Steering | API GL-4, SAE 10W | Verify in manual |
| Washer Fluid | Standard Windshield Washer Fluid | 1 Gallon |
| DEF | ISO 22241 (API DEF certified) | 10-20 Gallons |
Capacities are approximate and vary based on specific configurations (e.g., engine size, axle ratios, transmission models). Always verify in your owner's manual or OEM service information.
Engine Oil
For the 2025 Kenworth T680, the primary recommendation for engine oil is an API CK-4 rated lubricant, with a viscosity grade of SAE 15W-40. API CK-4 oils are specifically formulated for modern diesel engines with exhaust aftertreatment systems, providing enhanced protection against oxidation, shear stability, and aeration. These robust oils are designed to handle the severe operating conditions encountered in heavy-duty applications, ensuring optimal engine longevity and performance.
While 15W-40 is the most common and widely recommended viscosity, some operating environments or engine models may permit or recommend alternative viscosity grades such as SAE 10W-30 or 5W-40, provided they meet the API CK-4 specification. Always consult your owner's manual or the specific engine manufacturer's guidelines for the definitive viscosity recommendation for your engine and climate.
Capacity: Engine oil capacities for the Kenworth T680 can vary significantly depending on the specific engine installed (e.g., Cummins X15, PACCAR MX-13). Typically, capacities range from 40 to 48 quarts. Always verify the exact capacity for your vehicle
More specs for the 2025 Kenworth T680
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
Maintenance & repair guides
2025 Kenworth T680 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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