2025 Mercedes-Benz Metris Fluid Type Specs

Quick Reference

Fluid	Type/Spec	Capacity
Engine Oil	Mercedes-Benz Approved MB 229.52, MB 229.51, or MB 229.31 (SAE 5W-30 or SAE 0W-30 recommended)	Verify in owner's manual
Engine Coolant	Mercedes-Benz Approved Antifreeze/Coolant (MB 325.0, MB 325.6, or MB 326.0 depending on concentration)	Verify in owner's manual
Transmission Fluid	Mercedes-Benz Approved Automatic Transmission Fluid (MB 236.15 for 7G-TRONIC PLUS)	Verify in owner's manual
Rear Differential Fluid	Mercedes-Benz Approved Hypoid Gear Oil (MB 231.1 or MB 235.7 for standard differentials)	Verify in owner's manual
Brake Fluid	Mercedes-Benz Approved DOT 4 PLUS (MB 331.0)	Verify in owner's manual
Power Steering Fluid	Electro-hydraulic system; consult owner's manual for specific fluid requirements if applicable (unlikely a traditional hydraulic system)	Verify in owner's manual
Washer Fluid	Mercedes-Benz Approved Washer Fluid or commercially available windshield washer fluid	As needed
Diesel Exhaust Fluid (DEF)	AdBlue® according to ISO 22241 (Mercedes-Benz Approved)	Verify in owner's manual

Engine Oil

For the 2025 Mercedes-Benz Metris, it is crucial to use only engine oils that meet specific Mercedes-Benz approvals. Depending on your engine variant (gasoline or diesel), the primary specifications to look for are MB 229.52, MB 229.51, or MB 229.31. These specifications dictate not only the viscosity grade but also the performance characteristics, especially for vehicles equipped with diesel particulate filters (DPFs) or gasoline particulate filters (GPFs).

Mercedes-Benz generally recommends a SAE 5W-30 or SAE 0W-30 viscosity grade for optimal performance and fuel efficiency in most operating conditions. Always consult your owner's manual or the service information for the most accurate and up-to-date recommendation specific to your vehicle's engine code and regional climate. Using an incorrect oil can lead to premature wear, reduced engine efficiency, and potential damage to emission control systems.

Interval: Mercedes-Benz vehicles typically have flexible service intervals determined by the Flexible Service System (FSS) based on driving conditions and time. However, a general guideline is every 10,000 miles or 1 year, whichever comes first. Always adhere to the schedule outlined in your owner's manual and service booklet.

Common Pitfalls: Never use engine oils that do not explicitly state compliance with the required Mercedes-Benz approval (e.g., MB 229.52). Generic "European car" oils may not meet the stringent internal specifications Mercedes-Benz demands, potentially compromising engine longevity and warranty coverage. Avoid mixing different oil types, even if they claim similar specifications, as this can dilute the additive package intended for your engine.

Engine Coolant

Maintaining the correct engine coolant is vital for proper engine temperature regulation and corrosion protection. Mercedes-Benz specifies its own approved coolants, typically colored blue or blue-green, though always verify the specific color and part number for your year and model. The primary approvals to look for include MB 325.0, MB 325.6, or MB 326.0, depending on the concentration (pre-mixed or concentrate requiring dilution).

These coolants are typically a silicate-containing, hybrid organic acid technology (HOAT) or a similar chemistry designed to protect Mercedes-Benz specific materials. It is critical to use distilled water if you are mixing a concentrate, as tap water can introduce minerals that can lead to scaling and corrosion.

Interval: Mercedes-Benz coolants are designed for long-life operation, often suggesting a replacement interval of every 15 years or 150,000 miles. However, regular inspection for leaks and verification of proper concentration (using a refractometer) is recommended during routine service. Always refer to your owner's manual for the precise interval.

Common Pitfalls: Never mix different types or colors of coolant, especially traditional Green (IGC) coolants with Mercedes-Benz approved coolants. Mixing can lead to chemical reactions that form precipitates, clog cooling passages, and cause severe engine damage. The use of universal or "all-makes, all-models" coolants that do not explicitly state a Mercedes-Benz approval is strongly discouraged.

Transmission Fluid

The 2025 Mercedes-Benz Metris is likely equipped with a 7G-TRONIC PLUS automatic transmission. These advanced transmissions require highly specific fluids to ensure smooth shifting, optimal performance, and longevity. The correct fluid will meet Mercedes-Benz specification MB 236.15.

Always verify the transmission type in your owner's manual, as Mercedes-Benz uses different fluid specifications for various transmission models. Using an incorrect transmission fluid can lead to harsh shifts, transmission damage, and costly repairs.

Interval: Mercedes-Benz generally recommends a transmission fluid and filter change between 30,000 to 60,000 miles, depending on the driving conditions. Some newer models may have longer intervals. Always consult your owner's manual for the exact recommended service schedule.

Common Pitfalls: Never use "universal" ATF or fluids that do not meet the precise MB 236.15 specification. Even fluids claiming to be "compatible" may lack the exact additive package and friction modifiers required by Mercedes-Benz transmissions, leading to premature wear or operational issues.

Rear Differential Fluid

The rear differential in your Metris, whether it's a standard open differential or a limited-slip differential (if equipped, though less common on commercial vans), requires a specific hypoid gear oil. For standard differentials, the fluid will typically meet Mercedes-Benz specifications MB 231.1 or MB 235.7. The common viscosity for these applications is often a SAE 75W-90, but always confirm the exact requirement in your owner's manual.

If your vehicle were equipped with a limited-slip differential, it would require a specific fluid with friction modifiers, usually denoted by an "LS" in the product name or a separate additive. However, this is unlikely for the standard Metris. Using the correct fluid is essential for protecting the gears and bearings within the differential from wear.

Interval: Differential fluid is often considered a "lifetime" fluid by some manufacturers, but for optimal longevity, particularly in vehicles that experience heavy loads or frequent towing, a service interval of around 60,000 to 100,000 miles is a wise preventative measure. Refer to your owner's manual for Mercedes-Benz's official recommendation.

Common Pitfalls: Using a gear oil that does not meet the specified MB approval can lead to premature wear of the differential components. If you have a limited-slip differential (which is rare on a Metris), ensure the fluid has the necessary friction modifiers or add them separately as directed by the manufacturer.

Brake Fluid

Mercedes-Benz vehicles require a high-quality brake fluid to ensure optimal braking performance and longevity of braking system components. For the 2025 Metris, the specified fluid is typically a Mercedes-Benz Approved DOT 4 PLUS fluid, meeting specification MB 331.0. This fluid is designed to have a high wet boiling point, which is crucial for preventing vapor lock in the brake lines under heavy braking.

DOT 4 PLUS fluids often exceed the minimum performance requirements of standard DOT 4 fluids, offering enhanced wear protection and moisture resistance.

Interval: Brake fluid is hygroscopic, meaning it absorbs moisture from the air over time. This moisture lowers the fluid's boiling point, which can lead to a spongy pedal and reduced braking effectiveness. Mercedes-Benz typically recommends replacing the brake fluid every two years, regardless of mileage. This maintains the integrity of the hydraulic system and prevents corrosion of internal components.

Common Pitfalls: Never use DOT 5 silicone-based fluid in a system designed for DOT 4 or DOT 4 PLUS, as they are incompatible and can cause severe damage to seals and braking components. Avoid mixing different DOT classifications (e.g., DOT 3 and DOT 4) as this can dilute the performance characteristics. Always use fresh, sealed brake fluid, as opened containers can rapidly absorb moisture from the atmosphere. Ensure all work on the braking system is performed by a qualified technician.

Power Steering Fluid

The 2025 Mercedes-Benz Metris features an electro-hydraulic power steering system. Unlike traditional hydraulic power steering systems that rely on a pump driven by the engine, these systems often have a self-contained electric pump. As such, a separate, user-serviceable power steering fluid reservoir might not be present or might use a very specific, long-life fluid that is not part of routine maintenance.

Interval & Pitfalls: Always consult your owner's manual or an authorized Mercedes-Benz service center for information on power steering fluid for your specific Metris. Attempting to add fluid to a sealed electro-hydraulic system without proper knowledge can cause damage. If a top-up or flush is ever required, only use the Mercedes-Benz specified fluid.

Washer Fluid

For the windshield washer system, any commercially available, high-quality windshield washer fluid is generally acceptable. For best results and to prevent streaking or freezing in colder climates, it is recommended to use a Mercedes-Benz Approved Washer Fluid or a premium brand that offers good cleaning performance, especially for insect removal and road grime.

Interval: Top up as needed. For winter driving, ensure the fluid has adequate freeze protection for your climate.

Common Pitfalls: Avoid using plain water, especially in freezing temperatures, as it can freeze and damage the washer system components. Mixing different types of washer fluid is generally harmless, but using a quality fluid will yield better cleaning results.

Diesel Exhaust Fluid (DEF)

If your 2025 Mercedes-Benz Metris is a diesel model, it will require Diesel Exhaust Fluid (DEF), also known as AdBlue®. DEF is a non-toxic solution of urea and de-ionized water, used in Selective Catalytic Reduction (SCR) systems to reduce nitrogen oxide (NOx) emissions.

It is critically important to use only DEF that meets the international standard ISO 22241. Mercedes-Benz specifically approves AdBlue® products that comply with this standard. Using non-compliant DEF can damage the SCR system and lead to costly repairs and potential emission system fault codes.

Interval: The DEF consumption rate varies based on driving conditions, load, and engine operation. The vehicle's instrument cluster will provide warnings and indications of low DEF levels, prompting you to refill. Mercedes-Benz generally designs the DEF tank to last between service intervals for typical driving, but frequent top-ups may be necessary for high-mileage users or those carrying heavy loads.

Common Pitfalls: Never put DEF into the diesel fuel tank, or vice versa, as this will cause severe and immediate damage to respective systems. Store DEF in a cool, dry place away from direct sunlight, and always use fresh DEF from sealed containers. DEF has a shelf life, typically around 1-2 years, so avoid using old or contaminated fluid. Do not overfill the DEF tank. If the DEF tank runs completely empty, the vehicle's performance may be severely limited, or it may not restart until refilled.

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