Nissens 996270 Engine Coolant Reservoir

Engine Coolant Reservoir for BMW Cooling Systems

This Nissens engine coolant reservoir is a pressurized plastic replacement tank built for BMW cooling system service. It includes a cap, level sensor, and mounting bracket, with a 1.55L capacity for direct-fit maintenance on select BMW 5 Series and 6 Series applications.

Key Features

• Brand: Nissens
• Part number: 996270
• Engine coolant reservoir for thermal system repair
• Plastic construction
• Pressurized design
• 1.55L capacity
• Cap included with high quality plastic cap type
• Level sensor included
• Mounting bracket included
• Cross-reference: Genuine 17137542986

Detailed Description

Nissens 996270 is an engine coolant reservoir engineered for BMW cooling system applications where stable coolant storage and pressure control are required. As part of Nissens’ thermal management range, this reservoir is developed with attention to fit, material quality, and system function. It is a direct replacement option for BMW 550i, 650i, 525i, 525xi, 530i, 530xi, 545i, and 645Ci models listed below. This part number, 996270, is a practical choice when replacing a cracked tank, a leaking reservoir, or a failed level sensor assembly.

Compatible With

• Fits 2006-2010 BMW 550i, N/A
• Fits 2006-2010 BMW 650i, N/A
• Fits 2004-2007 BMW 525i, N/A
• Fits 2006-2007 BMW 525xi, N/A
• Fits 2006-2007 BMW 530i, N/A
• Fits 2001-2003 BMW 530i, N/A
• Fits 2006-2007 BMW 530xi, N/A
• Fits 2004-2005 BMW 545i, N/A
• Fits 2004-2005 BMW 645Ci, N/A

What It Helps Fix

• Coolant loss from a cracked or leaking reservoir
• Low coolant warnings caused by a faulty level sensor
• Pressure-related cooling system issues from a worn tank
• Damaged reservoir mounting points or bracket failure
• Service replacement for aging BMW coolant expansion tanks

Installation Notes and Tips

Verify the reservoir shape, sensor connection, and cap style against the original unit before installation. Inspect the cooling system for hose wear, cap sealing surfaces, and any signs of contamination before refilling. After installation, bleed the cooling system according to BMW service procedures and confirm there are no leaks at the tank, cap, or hose connections.

Quality Assurance

Nissens develops thermal and engine efficiency components for the aftermarket with a focus on consistent manufacturing quality and application coverage. This reservoir is part of that OE-style replacement approach for BMW cooling system service.