Vaico V20-0578 Engine Coolant Reservoir

BMW Engine Coolant Reservoir

The Vaico V20-0578 engine coolant reservoir is a direct-fit replacement for select BMW cooling systems that use OE number 17117573781. Built to match the listed dimensions and supplied with a sensor, it supports accurate coolant level monitoring in BMW X3, X5, 325Ci, 330Ci, 320i, 325i, 325xi, 330i, 330xi, 323Ci, 323i, 328Ci, and 328i applications.

Key Features

• Engine coolant reservoir for BMW cooling system service
• Includes sensor provision for coolant level monitoring
• Dimensions: 363 mm length, 108 mm width, 121 mm height
• OE reference: 17117573781
• Vaico part number V20-0578 for catalog and fitment lookup

Product Details

VAICO product line components are built for European vehicle service applications, with attention to OE-style fit and system-specific replacement needs. This coolant expansion tank is specified for BMW models across the 1999-2009 range and is listed with multiple cross-reference numbers, including Gates 51930 and URO 17137787039, for the same application. The Vaico V20-0578 is a practical replacement when the original reservoir is cracked, leaking, or no longer maintaining proper coolant level control.

Compatible With BMW X3, BMW X5, BMW 325Ci, BMW 330Ci, BMW 320i, BMW 325i, BMW 325xi, BMW 330i, BMW 330xi, BMW 323Ci, BMW 323i, BMW 328Ci, and BMW 328i applications that use the referenced OE number.

Common Problems This Part Can Address

• Coolant loss from a cracked or aged reservoir
• Warning light issues related to coolant level sensing
• Visible staining or seepage around the expansion tank
• Pressure retention problems caused by a damaged plastic tank
• Service replacement for a reservoir that no longer matches OE fitment

Installation Notes and Tips

Verify OE number 17117573781 and compare the reservoir dimensions before installation. Inspect the sensor connection, hoses, cap sealing surfaces, and surrounding cooling system components for wear or contamination. After installation, refill and bleed the cooling system according to BMW service procedures to remove trapped air and confirm proper coolant level operation.

Quality Assurance

Vaico V20-0578 is an aftermarket replacement engineered for the listed BMW applications and specified dimensions. Confirm fitment against the vehicle’s OE number and cooling system configuration before ordering.