2022 Mercedes-Benz Metris Fluid Specifications

Quick Reference

Fluid	Type/Spec	Capacity
Engine Oil	Mobil 1 ESP 5W-30 (MB-Approval 229.51 / 229.52)	6.1 L (6.4 qt)
Engine Coolant	MB 325.0 / 326.0 (G48)	~10.4 L (11.0 qt)
Transmission Fluid	MB 236.41 (ATF 3353)	8.0 L (8.5 qt)
Rear Differential	MB 235.7/235.74 (75W-85)	~1.0 L (1.1 qt)
Brake Fluid	MB 331.0 (DOT 4+)	~1.0 L (1.1 qt)
Power Steering	MB 236.3 (Pentosin CHF 11S)	~1.0 L (1.1 qt)
Windshield Washer	MB 349.1 (SummerFit) / 349.2 (WinterFit)	5.0 L (5.3 qt)

Engine Oil

The 2022 Metris with the M274 2.0L turbocharged gasoline engine requires an oil that meets Mercedes-Benz MB-Approval 229.51 or 229.52. The recommended viscosity is 5W-30. Many owners and shops default to Mobil 1 ESP 5W-30, as it carries the necessary approvals. These oils are specialized low-ash (Low SAPS) formulas designed for modern European engines with advanced emissions equipment. Using a non-approved oil can lead to premature wear and damage to the catalytic converter.

Change intervals are dictated by the vehicle's onboard computer, but a general rule of thumb is every 10,000 miles or one year, whichever comes first. Always check the oil level after a change, as the capacity is a substantial 6.1 liters (6.4 quarts), including the filter.

Engine Coolant

Mercedes-Benz vehicles use a specific coolant formulation to protect the aluminum engine and cooling system components. For the Metris, this is a Hybrid Organic Acid Technology (HOAT) coolant meeting MB 325.0 or 326.0 specifications, often referred to as G48. It is typically blue in color. It is critical not to mix this with other coolant types like standard green IAT or orange OAT (e.g., Dex-Cool), as this can cause gelling and blockages in the cooling system, leading to overheating.

The system holds approximately 10.4 liters (11.0 quarts). When topping off or refilling, always use a 50/50 mixture of distilled water and concentrated G48 coolant or a pre-mixed G48 solution. Using tap water can introduce minerals that lead to scale and corrosion.

Transmission Fluid

The Metris is equipped with a 7-speed automatic transmission (722.9). This transmission requires a fluid meeting MB 236.41 specification, also known as ATF 3353. This is a synthetic fluid developed for this specific gearbox. Never use a "universal" or multi-vehicle ATF. Use of incorrect fluid can cause harsh shifting, transmission damage, and costly repairs.

The service interval is typically around 60,000 miles, but as always, verify with your service advisor or owner's manual. A full fluid and filter service requires specialized equipment to ensure the correct fluid level is achieved at a specific temperature.

Rear Differential

The rear axle requires a gear oil meeting MB 235.7 or 235.74 specification. This corresponds to a synthetic 75W-85 gear lubricant. This fluid provides the necessary protection for the hypoid gears under high torque loads. The capacity is approximately 1.0 liter (1.1 quarts). While often considered a "lifetime" fill by the manufacturer, changing the fluid every 60,000 to 80,000 miles is good preventative maintenance.

Brake Fluid

Brake fluid for the Metris must meet Mercedes-Benz specification MB 331.0, which is a DOT 4+ formulation. This is a low-viscosity fluid designed for the fast-acting ABS and traction control systems. While any high-quality DOT 4 fluid is technically compatible, sticking with the MB-spec fluid is the safest bet. Brake fluid is hygroscopic, meaning it absorbs moisture from the air, which lowers its boiling point and can corrode internal brake components. For this reason, it should be flushed and replaced every two years, regardless of mileage.

Power Steering

The Metris uses an electro-hydraulic power steering system that requires a specific hydraulic fluid, not standard power steering fluid or ATF. The correct fluid meets MB 236.3, which is typically Pentosin CHF 11S. This is a high-performance synthetic hydraulic fluid designed for a wide temperature range. Using the wrong fluid can damage the pump and steering rack.

Windshield Washer Fluid

While any quality washer fluid will work, Mercedes-Benz offers its own branded products. MB SummerFit (MB 349.1) is a concentrate for summer use, while MB WinterFit (MB 349.2) includes freeze protection for colder climates. The reservoir holds a generous 5.0 liters (5.3 quarts).

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