Dorman 918-280 Automatic Transmission Oil Cooler

Automatic Transmission Oil Cooler for BMW

This Dorman automatic transmission oil cooler is a direct replacement for the original equipment trans cooler, built to match fit and function for a reliable repair. It is a standard replacement option for BMW applications that need consistent transmission fluid cooling, including BMW 525i, 530i, 545i, 645Ci, 745i, and 745Li models.

Part number 918-280 is engineered for precise design standards and tested for fit and performance. With aluminum construction, hose barb inlet and outlet connections, and a chrome finish, this transmission cooler is built for straightforward replacement service on select BMW vehicles.

Key Features

• Direct replacement automatic transmission oil cooler
• Fits select 2001-2005 BMW 525i and 530i applications
• Fits select 2004-2005 BMW 545i and 645Ci applications
• Fits select 2002-2005 BMW 745i and 745Li applications
• Aluminum construction with chrome finish
• Hose barb inlet and outlet connections, 0.57 in diameter
• Standard replacement grade for OE-style service
• Part number 918-280

Detailed Description

Dorman 918-280 is an automatic transmission oil cooler made to replace the original trans cooler on select BMW models. It is designed around the original fit and function so the cooler integrates properly with the vehicle’s transmission cooling system. The aluminum core and 13-row construction support fluid heat exchange in a compact package measuring 3.1 in wide, 5.2 in deep, and 2.2 in high.

This part cross-references SKP SK90623 and OE reference 17217519213 for the same application. For BMW 525i, 530i, 545i, 645Ci, 745i, and 745Li service, part number 918-280 provides a direct replacement path when the original cooler is damaged, leaking, or no longer performing as expected.

What It Helps Solve

• Transmission fluid overheating caused by a failing cooler
• Fluid leaks from a cracked or corroded cooler body
• Reduced cooling performance in the transmission system
• Replacement needs after impact or age-related wear
• Restoration of OE-style cooling function on BMW 525i, 530i, 545i, 645Ci, 745i, and 745Li models

Installation Notes and Tips

Verify the vehicle’s original cooler dimensions and hose barb connection size before installation. This unit uses hose barb inlet and outlet attachments with no installation hardware included, so reuse or source the required mounting and hose components as needed. Inspect transmission lines, seals, and surrounding cooling components during replacement to help prevent repeat leaks.

Quality Assurance

This Dorman transmission oil cooler has undergone extensive testing to confirm adherence to precise design standards. It is a standard replacement part built for direct-fit service on the listed BMW applications, including 2001-2005 BMW 525i and 530i, 2004-2005 BMW 545i and 645Ci, and 2002-2005 BMW 745i and 745Li.