Mercedes SLK R172 M271 M276 Coolant Hose Cooler Water Line A1725012382

The oil cooler coolant return hose for the Mercedes SLK R172 with a petrol engine is a cooling system component specifically designed for M271 and M276 units. It is responsible for the safe return of coolant from the oil cooler, stabilizing engine and oil operating temperatures. A used, original hose ensures factory-set routing geometry and proper medium flow under demanding operating conditions.

Specifications and technical data

• SKU: A1725012382
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1725012382
• Substitutable numbers: A1725012382, A 172 501 23 82
• Fuel type: Petrol
• Part type: Hose
• Category: Coolant Hoses

Purpose and Function in the Cooling System

This hose belongs to the group of Cooling System Hoses and Pipes and operates in the return circuit of fluid from the oil cooler to the engine's water system. In Mercedes SLK R172 vehicles with M271/M276 petrol engines, it is responsible for:

• draining heated coolant from the oil cooler,
• maintaining stable engine oil temperature,
• supporting the protection of the powertrain against overheating under heavy load.

Thanks to its appropriate shape and internal diameter, the hose ensures proper fluid flow, which translates to stable cooling system operation and predictable engine behavior in city traffic and at higher speeds.

Compatibility with M271 and M276 Petrol Engines

The component has been designed to work with petrol units, meaning it is adapted to the thermal characteristics of the M271 and M276 engines used in the Mercedes SLK R172. The hose's design takes into account:

• the arrangement of oil cooler and water system connections in the engine bay,
• appropriate length and bending profile, minimizing stress during operation,
• operation within typical temperature and pressure ranges for petrol engines.

Such adaptation reduces the risk of leaks, hose kinking, or rubbing against adjacent components, which is particularly important in the compact design of the SLK roadster.

Characteristics of a Used OEM Part

The hose is a genuine Mercedes component in used condition, which practically means factory-matched fit for mounting points, connection diameters, and cooling system routing. Compared to aftermarket alternatives:

• it facilitates installation by maintaining original geometry,
• it reduces the need for modifications or additional seals,
• it maintains compliance with the manufacturer's original engineering specifications.

A used part allows for economical repair while maintaining the original cooling system specification, which is especially important for precisely tuned petrol engines.

Importance for Engine and Oil Cooler Durability

A functional water return hose from the oil cooler directly impacts engine lifespan and the stability of oil operating parameters. Leaks, reduced flow cross-section, or improper hose routing can lead to:

• localized overheating of oil and coolant,
• accelerated wear of lubricated components,
• increased risk of failure during dynamic driving.

Selecting the correct, original hose is therefore an important element of professional cooling system maintenance for the Mercedes SLK R172 with a petrol engine.

Technical Support and Additional Materials

To better plan cooling system diagnostics and repairs, it is advisable to consult the guide on typical overheating symptoms and principles of selecting cooling components. Practical tips can be found in the article Engine Cooling System – Overheating, Repair, and Used Coolers, which discusses the impact of the oil cooler and associated components on powertrain durability.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other parts from the same group, such as additional hoses, pipes, or fluid return sections, check the available parts in the Mercedes Cooling System Hoses and Pipes category.