2018 Mercedes-Benz Sprinter: Coolant Capacity and Type

The 2018 Mercedes-Benz Sprinter has a total cooling system capacity that varies by engine, but most models hold between 10.6 and 12.7 quarts (10.0 to 12.0 liters) of coolant.

Quick Answer

• Total Cooling System Capacity: 10.6–12.7 quarts (10.0–12.0 liters)
• OEM Coolant Specification: MB 325.0, 326.0 (G48) or MB 325.6, 326.6 (G40). Color is typically Blue-Violet.
• Coolant Chemistry: Hybrid Organic Acid Technology (HOAT) or Si-OAT.
• Mix Ratio: 50/50 mix of coolant and distilled water.

Capacity by Engine Option

The 2018 Sprinter was available with two engine options, which have slightly different cooling system capacities.

It is critical to use the correct coolant type. Mercedes-Benz specifies a HOAT (Hybrid Organic Acid Technology) or Si-OAT coolant meeting their MB 325.0/326.0 or MB 325.6/326.6 specification. The corresponding aftermarket designation is often G48 or G40. The coolant is typically blue-violet in color. Using an incorrect coolant can lead to corrosion and damage to the cooling system components.

Flush Interval

Mercedes-Benz has extended the coolant service intervals for its modern vehicles, including the Sprinter.

• Normal Service: The factory-fill coolant is designed to last up to 15 years or 150,000 miles.
• Severe Duty: If the vehicle is operated under severe conditions (e.g., heavy towing, frequent short trips, extreme temperatures), it is advisable to inspect the coolant more frequently and consider a flush sooner, perhaps around 100,000 miles. Always check your owner's manual for the specific recommendation for your vehicle.

How to Refill & Bleed

Properly refilling and bleeding the cooling system on a Sprinter is crucial to avoid air pockets, which can cause overheating.

1. Mix Coolant: Ensure you are using a 50/50 mixture of approved Mercedes-Benz coolant and distilled water. Do not use tap water.
2. Slow Fill: Add the coolant to the expansion tank slowly to minimize the introduction of air.
3. Bleeding Procedure: Unlike many vehicles, Sprinters often do not have traditional bleeder screws. The system is designed to be bled using a vacuum-fill tool. This tool pulls the entire cooling system into a deep vacuum, removing all air, and then uses the vacuum to draw fresh coolant in, resulting in a perfectly filled, air-free system. While it is possible to bleed the system without this tool by running the engine with the heater on high and the expansion tank cap loose, it is not recommended. An incomplete bleed can easily lead to overheating and potential engine damage.

Common Cooling System Issues

While generally robust, the NCV3 generation of Sprinters (2007-2018) can experience a few common cooling system problems:

• EGR Cooler Leaks: The Exhaust Gas Recirculation (EGR) cooler is a known weak point. It can develop internal leaks, allowing coolant to be consumed by the engine. Symptoms include gradual coolant loss without any visible external leaks.
• Radiator Leaks: Leaks can develop at the seams where the plastic end tanks are crimped to the aluminum core. This is more common on higher-mileage vehicles.
• Water Pump Failure: While not excessively common, the water pump can fail, leading to leaks from the weep hole or a complete loss of coolant circulation.
• Expansion Tank Cracks: The plastic expansion tank can become brittle with age and develop hairline cracks, causing slow coolant leaks and pressure loss.

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