2215000649 Coolant Reservoir Overflow Expansion Tank for W221 for S63 2010 2105010515 Material: plastic Compatibility: Designed for W221 for S63 2010 and fits OE number 2215000649 Performance: Constructed to operate under temperatures up to 105℃, supporting stable cooling system function Design: Features a compact and streamlined structure that integrates into the engine bay Installation: Direct replacement unit, designed for straightforward installation without modifications Certification: Meets quality standards with POKESS certification This coolant reservoir overflow expansion tank supports the thermal management of the vehicle's engine by maintaining coolant levels within the system.Made from plastic, it is built to endure prolonged exposure to operating temperatures.The design allows for efficient use of space while contributing to the overall visual layout of the engine compartment.Suitable for use in various driving conditions, it serves as a functional component for cooling system maintenance.Its compatibility with specified models ensures proper fitment and. This is a replacement item from an aftermarket supplier.Brand names are cited solely to demonstrate device compatibility.