2023 Kenworth T680 Coolant Capacity & Type

The 2023 Kenworth T680 holds approximately 50-70 quarts (47-66 liters) of coolant in its cooling system, depending on the specific engine and cooling system configuration.

Quick Answer

• Total Cooling System Capacity: 50-70 quarts (47-66 liters)
• OEM Coolant Spec: Extended Life Coolant (ELC) - often red/pink or purple, OAT (Organic Acid Technology) or HOAT (Hybrid Organic Acid Technology) based, meeting Cummins CES14603 or PACCAR's própria ELC specification. Always verify with your owner's manual or Kenworth dealership for the precise specification for your engine (e.g., Cummins X15, PACCAR MX-13).
• Mix Ratio: 50/50 prediluted coolant or 50% concentrate mixed with 50% distilled water.

Capacity by Engine Option

The Kenworth T680 can be equipped with various engines, and the cooling system capacity will vary accordingly. Consult your owner's manual for exact figures. Typical capacities are:

• Cummins X15 Engine: Approximately 60-70 quarts (57-66 liters)
• PACCAR MX-13 Engine: Approximately 50-60 quarts (47-57 liters)

These figures are approximate and can change based on radiator size, presence of auxiliary heaters, and other options.

Flush Interval

Maintaining your coolant is crucial for the longevity of your engine. The flush interval for a 2023 Kenworth T680 with Extended Life Coolant (ELC) is significantly longer than older conventional coolants.

• Normal Duty: Typically 600,000 miles, 6 years, or 12,000 hours, whichever comes first. This applies to vehicles operating under standard conditions with regular maintenance.
• Severe Duty: For vehicles operating under extreme conditions (e.g., heavy hauling, frequent idling, very dusty environments, extreme temperatures), it is advisable to check the coolant sooner, potentially around 300,000 miles, 3 years, or 6,000 hours. Always follow the manufacturer's maintenance schedule in your owner's manual.

Regularly check your coolant