2020 Mercedes-Benz Metris Fluid Type Specs

As an ASE-Certified Master Technician, I've compiled a complete guide to all factory-spec fluids for your 2020 Mercedes-Benz Metris. This reference will help you maintain your vehicle to the manufacturer's standards, ensuring longevity and optimal performance. Always verify the latest specifications in your owner's manual or an authorized Mercedes-Benz service information system.

<h2>Quick reference</h2>

Fluid	Type/Spec	Capacity
Engine Oil	Mercedes-Benz MB 229.5 or MB 229.51 (5W-40 recommended)	~7.4 US Quarts (7.0 liters)
Engine Coolant	Mercedes-Benz Spec MB 325.0 (Blue, Silicate-Free HOAT)	~10.6 US Quarts (10.0 liters) with expansion tank
Transmission Fluid	Mercedes-Benz Spec MB 236.15 (Life-long fill, but serviceable)	~9.6 US Quarts (9.1 liters) for full service
Rear Differential Fluid	Mercedes-Benz Spec MB 235.7/235.74 (Hypoid Gear Oil)	~1.9-2.3 US Quarts (1.8-2.2 liters)
Brake Fluid	Mercedes-Benz Spec MB 331.0 / DOT 4 PLUS	~1.1 US Quarts (1.0 liter)
Power Steering Fluid	Mercedes-Benz Spec MB 236.3 (Pentosin CHF 11S or equivalent)	~1.1 US Quarts (1.0 liter)
Washer Fluid	Mercedes-Benz approved (non-foaming, anti-freeze)	~5.3 US Quarts (5.0 liters)
Diesel Exhaust Fluid (DEF)	ISO 22241 / AdBlue® approved	~5.3 US Gallons (20.0 liters)

<h2>Engine Oil</h2>

For the 2020 Mercedes-Benz Metris, Mercedes-Benz specifies engine oils meeting either MB-Approval 229.5 or MB-Approval 229.51. While 5W-40 is a commonly recommended viscosity for many climates and operating conditions, always consult your owner's manual for the specific viscosity range recommended for your region and engine type. The Metris typically uses a 2.0L turbocharged inline-4 gasoline engine (M274). The capacity is approximately 7.4 US Quarts (7.0 liters) with a filter change.

Intervals: The typical service interval for engine oil is 10,000 miles or 1 year, whichever comes first, under normal operating conditions. However, the Flexible Service System (FSS) in your Metris will indicate the optimal time for an oil change based on driving conditions. Always adhere to the FSS recommendations or the stricter of the time/mileage intervals.

Common Pitfalls: Never use engine oils that do not explicitly state compliance with MB 229.5 or MB 229.51. Using non-approved oils can lead to premature engine wear, reduced fuel efficiency, and potential issues with emissions control systems. MB 229.5 oils are generally higher SAPS (Sulfated Ash, Phosphorus, Sulfur) designed for gasoline engines without particulate filters, while MB 229.51 are mid-SAPS oils suitable for both gasoline and diesel engines, especially those equipped with Diesel Particulate Filters (DPFs).

<h2>Engine Coolant</h2>

The 2020 Mercedes-Benz Metris requires an ethylene-glycol based, silicate-free Hybrid Organic Acid Technology (HOAT) coolant that meets Mercedes-Benz Spec MB 325.0. This coolant is typically blue in color. The total cooling system capacity is approximately 10.6 US Quarts (10.0 liters) including the expansion tank.

Intervals: Mercedes-Benz generally specifies a very long service life for its factory coolant, often considered "lifetime" in many markets (up to 15 years or 150,000 miles). However, it's good practice to inspect the coolant level and condition periodically. If the coolant looks discolored or contains sediment, it should be flush and replaced sooner.

Common Pitfalls: Do NOT mix different types of coolants. Mixing OAT, HOAT, or IAT coolants can lead to chemical reactions that cause gel formation, corrosion, and damage to the cooling system components, including the water pump, radiator, and heater core. Always use MB 325.0 approved coolant or an equivalent that explicitly states compliance with this specification. Never use plain water.

<h2>Transmission Fluid</h2>

The 2020 Mercedes-Benz Metris, equipped with a 7G-TRONIC PLUS (722.9) automatic transmission, uses transmission fluid conforming to Mercedes-Benz Spec MB 236.15. This is a low-viscosity, fuel-efficient fluid. While Mercedes-Benz often considers the transmission fluid a "lifetime fill" in some regions, it is still serviceable and recommended for replacement at specific intervals, especially under severe driving conditions. A full service, including torque converter drain, can require approximately 9.6 US Quarts (9.1 liters).

Intervals: For optimal performance and longevity, a transmission fluid and filter change is typically recommended between 60,000 to 80,000 miles, or every 5 years, whichever comes first. Consult your owner's manual for precise intervals based on your driving conditions.

Common Pitfalls: Using non-MB 236.15 approved fluid is a significant risk. Universal ATFs or fluids designed for other manufacturers' specifications will not provide the correct friction characteristics or protection, leading to premature wear, harsh shifting, and potential transmission failure. Always use genuine Mercedes-Benz fluid or an explicitly approved aftermarket equivalent.

<h2>Rear Differential Fluid</h2>

For the rear differential, the 2020 Mercedes-Benz Metris requires a hypoid gear oil meeting Mercedes-Benz Spec MB 235.7 or MB 235.74. The capacity typically ranges from 1.9 to 2.3 US Quarts (1.8-2.2 liters), depending on the specific differential installed. This is generally a high-quality 75W-85 or 75W-90 synthetic gear oil.

Intervals: Differential fluid is often considered a "lifetime" fluid by Mercedes-Benz under normal driving. However, for vehicles used for heavy hauling, towing, or in extreme climates, it is advisable to consider replacement every 100,000 miles or 10 years to ensure maximum component life.

Common Pitfalls: Ensure the gear oil explicitly meets MB 235.7 or MB 235.74. While many gear oils share similar viscosity ratings, the additive packages are crucial for proper lubrication and protection of the hypoid gears. Do not use gear oils designed for limited-slip differentials unless specifically called for by Mercedes-Benz, as the Metris typically does not feature a mechanical LSD.

<h2>Brake Fluid</h2>

The 2020 Mercedes-Benz Metris uses brake fluid that meets Mercedes-Benz Spec MB 331.0, which corresponds to a DOT 4 PLUS specification. This is a high-performance brake fluid designed for modern braking systems, offering a high wet boiling point. The capacity of the brake fluid reservoir is approximately 1.1 US Quarts (1.0 liter).

Intervals: Brake fluid is hygroscopic, meaning it absorbs moisture over time, which lowers its boiling point and can lead to corrosion in the braking system. Mercedes-Benz recommends replacing the brake fluid every 2 years or 20,000 miles, whichever comes first.

Common Pitfalls: Never use DOT 5 silicone-based fluid, as it is incompatible with conventional braking systems and can cause seal damage. While DOT 3 fluid is technically compatible, its lower boiling point makes it unsuitable for the Metris's braking system. Always ensure the fluid is fresh from a sealed container to prevent contamination with moisture.

<h2>Power Steering Fluid</h2>

For the power steering system, the 2020 Mercedes-Benz Metris requires a specialized hydraulic fluid that meets Mercedes-Benz Spec MB 236.3. This fluid is often green in color and typically corresponds to a product like Pentosin CHF 11S or an equivalent. The capacity is approximately 1.1 US Quarts (1.0 liter).

Intervals: Power steering fluid is often considered a "lifetime" fill by Mercedes-Benz. However, if you notice any unusual noise from the power steering pump, stiffness in steering, or discoloration of the fluid, a flush and refill might be beneficial. Regular inspection for leaks is also recommended.

Common Pitfalls: Do not use automatic transmission fluid (ATF) or generic power steering fluids, as they may not have the correct viscosity or additive package for the Mercedes-Benz power steering pump and seals. Only use fluids explicitly approved to MB 236.3.

<h2>Washer Fluid</h2>

The washer fluid reservoir for the 2020 Mercedes-Benz Metris has a capacity of approximately 5.3 US Quarts (5.0 liters). Mercedes-Benz recommends using an approved washer fluid that is non-foaming and contains anti-freeze properties suitable for your climate. In warmer climates, a high-quality streak-free washer fluid is sufficient. In colder climates, always use a winter-specific fluid with a low freezing point.

Intervals: Top off as needed.

Common Pitfalls: Avoid using plain water, especially in cold weather, as it can freeze and damage the washer fluid reservoir, pump, and lines. Some generic washer fluids can leave streaks or damage paint over time, so consider a reputable brand or Mercedes-Benz branded fluid.

<h2>Diesel Exhaust Fluid (DEF)</h2>

For diesel models of the 2020 Mercedes-Benz Metris (which are common in many markets), Diesel Exhaust Fluid (DEF) is critical for the Selective Catalytic Reduction (SCR) system. The DEF used must meet ISO 22241 standards and be explicitly labeled as AdBlue® approved. The DEF tank capacity is approximately 5.3 US Gallons (20.0 liters).

Intervals: The DEF consumption varies depending on driving conditions, engine load, and environmental factors. The vehicle's onboard computer will alert you when the DEF level is low and indicate how much to refill. Typically, DEF will last for several thousand miles between refills.

Common Pitfalls: Never put DEF in the fuel tank, and never put diesel fuel in the DEF tank. Only use high-quality, ISO 22241 certified DEF. Contaminated or poor-quality DEF can damage the SCR system, leading to costly repairs and potential derating of engine power. Store DEF in a cool, dry place away from direct sunlight.

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