Mercedes-Benz A B Class W169 W245 M266 Petrol Engine Oil Pump A2661800901

Mercedes-Benz A B Class W169 W245 M266 Petrol Engine Oil Pump is an original lubrication system component designed for M266 power units. It ensures stable oil pressure across the entire RPM range, which translates into safe engine operation and reduced wear of cooperating components. This is a practical solution for users looking for a proven, factory-spec design instead of unreliable replacements.

Specifications and technical data

• SKU: A2661800901
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2661800901
• Substitutable numbers: A2661800901, A 266 180 09 01, A2661800801, A 266 180 08 01, BG
• Fuel type: Petrol
• Category: Oil Pumps & Parts

Purpose and compatibility

The described oil pump is dedicated to M266 petrol engines used in Mercedes A-Class W169 and B-Class W245 models. The design was developed to meet the specific requirements of these units, ensuring proper lubrication under typical urban and highway driving conditions.

Its original Mercedes origin ensures that factory oil flow and pressure parameters are maintained, as well as proper fitment to the drivetrain without the need for modifications.

Construction and role in the lubrication system

The oil pump in the M266 engine is responsible for:

• pumping oil to the main gallery and channels lubricating the crankshaft, camshafts, and timing components,
• maintaining stable oil pressure across a wide range of operating temperatures,
• reducing friction and overheating of mating surfaces,
• removing contaminants to the oil filter, which supports system cleanliness.

Thanks to being matched to the specific fuel type, which is petrol, the pump's operating characteristics are tuned to the requirements of the M266 unit, which promotes smooth engine operation and proper protection of moving parts.

Practical application and benefits of installation

Using an original oil pump in a Mercedes A-Class or B-Class with an M266 engine allows for restoring proper lubrication parameters in the event of:

• oil pressure drops signaled by a dashboard warning light,
• engine overhaul after seizure or overheating,
• preventive replacement during major engine service work.

Choosing a used, original item from the Oil pumps and parts category is a reasonable compromise between cost and maintaining the factory design, especially for older vehicles where both reliability and repair economy matter.

Condition, verification, and technical aspects

The item is offered as a used part, which in practice means it comes from dismantling and can be an attractive alternative to new components, especially for larger repair scopes. In the case of oil pumps, it is important to verify the condition of working surfaces, clearances, and the cleanliness of oil channels according to the vehicle manufacturer's service procedures before installation.

To facilitate identification, markings such as SKU, OEM part number, and interchangeable numbers have been used, which allow matching the pump to a specific engine configuration and vehicle year. These parameters are available in the technical specifications section and are worth comparing with the vehicle documentation before purchase.

Technical support and additional information

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as pump housings, drive gears, or mounting elements, check the available parts in the Mercedes oil pumps and parts category.

When selecting used drivetrain components, it is worth paying attention to structural differences between individual equipment versions and power units. Helpful materials, such as the article Stock vs. sports suspension – design differences and is it worth buying used suspension parts?, which discusses the practical aspects of choosing second-hand parts, may also serve as a reference point when planning other repairs on the vehicle.