2023 Mercedes-Benz Metris Fluid Specifications

As an ASE-certified master technician, I know that maintaining a commercial or passenger van like the 2023 Mercedes-Benz Metris requires absolute precision. Mercedes-Benz engineering does not tolerate "universal" fluids or guesswork. The Metris, powered by the robust 2.0L turbocharged inline-4 (M274 engine) and mated to the 9G-Tronic transmission, demands exact adherence to the MB-Approval specification system. Using the wrong fluid can lead to catastrophic component failure, voided warranties, and costly downtime for your business or family.

Below is the complete fluid specification guide for the 2023 Mercedes-Benz Metris.

Quick reference

Fluid	Type/Spec	Capacity
Engine Oil	MB-Approval 229.5, 229.51, or 229.52 (5W-40 or 0W-40)	6.5 quarts (6.1 L)
Engine Coolant	MB 325.6 / 326.6 (Pink/Violet Si-OAT)	~9.5 quarts (9.0 L)
Transmission Fluid	MB-Approval 236.17 (9G-Tronic ATF)	~10.5 quarts (10.0 L) total
Rear Differential	MB-Approval 235.7 or 235.31 (75W-85 GL-5)	~1.2 quarts (1.1 L)
Transfer Case / Front Diff	N/A (Rear-Wheel Drive standard)	N/A
Brake Fluid	DOT 4 Plus (MB-Approval 331.0)	As needed to MAX line
Power Steering Fluid	N/A (Electric Power Steering)	N/A
Washer Fluid	MB SummerFit / WinterFit concentrate + Water	~2.6 quarts (2.5 L)
DEF (Diesel Exhaust Fluid)	N/A (Gasoline engine)	N/A

Note: Capacities are approximate dry-fill or total-system estimates. Always verify fluid levels manually and consult your owner's manual or OEM service info for VIN-specific variations.

Engine Oil

The 2023 Metris utilizes the 2.0L M274 turbocharged gasoline engine. For this engine, Mercedes-Benz strictly requires oils meeting MB-Approval 229.5, 229.51, or 229.52. The standard viscosity grades are 5W-40 or 0W-40 depending on your climate, though 5W-40 is the most commonly used weight in North America.

Intervals & Pitfalls: The standard service interval for the Metris is typically every 15,000 miles or 1 year (Service A/B schedule), but for severe commercial duty, stopping-and-going, or heavy idling, dropping this to 7,500 - 10,000 miles is highly recommended to prevent timing chain and turbocharger wear. Never use a standard API SP/ILSAC GF-6 oil that lacks the official MB-Approval rating on the back of the bottle. European engine tolerances require specific SAPS (Sulfated Ash, Phosphorus, Sulfur) levels to protect the advanced emissions systems and turbo bearings.

Engine Coolant

Mercedes-Benz coolant specifications transitioned to newer formulas in recent years. For the 2023 Metris, you must use MB 325.6 (Concentrate) or MB 326.6 (50/50 Premixed). This is a Silicate Organic Acid Technology (Si-OAT) coolant, typically pink or violet in color.

Intervals & Pitfalls: Coolant is generally rated for 150,000 miles or 15 years, but prudent preventative maintenance dictates a flush around the 100,000-mile mark. Do not mix Si-OAT coolant with older HOAT (blue/yellow) or standard green IAT coolants. Mixing incompatible coolants will cause the silicates to drop out of suspension, forming a thick gel that clogs the heater core, radiator, and turbo cooling lines. Only top off with distilled water and the correct MB-approved concentrate.

Transmission Fluid

The 2023 Metris features the 9G-Tronic 9-speed automatic transmission. This unit requires the extremely specific MB-Approval 236.17 ATF. This fluid is golden/yellow in color, distinguishing it from the older red or blue fluids used in previous 7G-Tronic gearboxes.

Intervals & Pitfalls: Transmission service is usually required at 75,000 miles, which involves draining the fluid, replacing the filter/pan assembly, and refilling at a very specific temperature using a scan tool to monitor transmission fluid temperature (TFT). Never use "universal" or multi-vehicle ATF in a 9G-Tronic. The friction modifiers in 236.17 are specifically engineered for the clutch pack materials and ultra-low viscosity requirements of this 9-speed unit. Incorrect fluid will cause harsh shifting, torque converter shudder, and eventual transmission failure.

Rear Differential Fluid

The rear differential in the Metris requires a high-quality GL-5 gear oil meeting MB-Approval 235.7 or 235.31. The specific weight is 75W-85. Because it is an open differential, no specialized limited-slip (LSD) friction modifiers are required.

Intervals & Pitfalls: While Mercedes-Benz often considers differential fluid "filled for life," ASE best practices dictate inspecting the fluid every 40,000 miles and replacing it every 80,000 to 100,000 miles, especially if the van is used for heavy towing or payload transport. Avoid using generic 75W-90 GL-5 unless it carries the specific MB-Approval, as the heavier weight and incorrect additive packages can cause accelerated wear on the pinion bearings.

Brake Fluid

The Metris brake system, which heavily integrates with the ESP (Electronic Stability Program) and ABS modules, requires DOT 4 Plus brake fluid meeting MB-Approval 331.0.

Intervals & Pitfalls: Brake fluid is hygroscopic (it absorbs moisture from the air). Mercedes-Benz mandates a brake fluid flush every 2 years, regardless of mileage. Moisture buildup lowers the boiling point of the fluid, causing brake fade under heavy commercial loads, and can corrode the expensive ABS/ESP hydraulic valves internally. Standard DOT 3 fluid has a lower boiling point and should never be used. DOT 5.1 is compatible but stick to DOT 4 Plus with the MB 331.0 spec for guaranteed performance. DOT 5 (silicone-based) is strictly prohibited.

Power Steering and Washer Fluid

Power Steering: The 2023 Metris utilizes Electromechanical Power Steering (EPS). There is no hydraulic pump, no lines, and no power steering fluid to check or replace.

Washer Fluid: Mercedes-Benz recommends using MB SummerFit or MB WinterFit concentrates mixed with water. For standard operation, any high-quality washer fluid will work, but avoid cheap fluids with heavy dyes or bug-wash additives, as they can coat the internal fluid level sensor in the reservoir, causing false "low washer fluid" dash warnings.

Diesel Exhaust Fluid (DEF)

The 2023 Metris in the North American market is exclusively powered by a gasoline engine. Therefore, it does not have a Diesel Particulate Filter (DPF) or Selective Catalytic Reduction (SCR) system, meaning no DEF is required.

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