2020 Kenworth T680 Coolant Capacity & Type
Your comprehensive guide to maintaining the cooling system of your 2020 Kenworth T680.
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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2020 Kenworth T680 Coolant Capacity & Type
A 2020 Kenworth T680 generally holds between 50 to 80 quarts (approximately 47 to 76 liters) of coolant, though capacity can vary significantly based on engine, radiator size, and specific truck configuration.
Quick Answer
- Total Cooling System Capacity (average): 50-80 quarts (47-76 Liters)
- OEM Coolant Spec: PACCAR (or Cummins/MX) approved Extended Life Coolant (ELC) - often a red/pink, purple or orange Nitrited Organic Acid Technology (NOAT) or Hybrid Organic Acid Technology (HOAT) formulation. Always refer to your engine manufacturer's specific recommendations (e.g., PACCAR, Cummins, MX).
- Mix Ratio: Typically 50/50 pre-mix, or 50% concentrate with 50% deionized water.
Capacity by Engine Option
The Kenworth T680 can be equipped with various PACCAR and Cummins engines, each having different cooling system capacities. The actual capacity can also be influenced by radiator size, presence of a bunk heater, and other auxiliary cooling components.
| Engine Type | Approximate Capacity (Quarts) | Approximate Capacity (Liters) |
|---|---|---|
| PACCAR MX-11 | 50-65 | 47-61 |
| PACCAR MX-13 | 60-75 | 57-71 |
| Cummins X15 | 65-80 | 61-76 |
Note: These are approximations. Always consult your owner's manual or the engine manufacturer's specifications for the precise capacity for your specific truck and engine combination.
Flush Interval
Maintaining the coolant flush interval is crucial for the longevity of your cooling system components and engine.
- Normal Duty: For most long-haul applications under typical operating conditions, an ELC coolant is designed to last for an extended period, often up to 600,000 miles or 6 years, whichever comes first. This usually includes adding an Extender/Booster at the halfway point (around 300,000 miles or 3 years).
- Severe Duty: If your T680 operates under severe conditions (e.g., frequent idling, extreme hot/cold climates, heavy loads, stop-and-go traffic, dusty environments, or frequent short trips), it is advisable to inspect and test the coolant more frequently and consider a flush and fill every 300,000 miles or 3 years. Always follow the specific recommendations of your engine manufacturer and coolant supplier.
Regularly check the coolant
More specs for the 2020 Kenworth T680
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
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
2020 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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