Calorstat TO7138.82J Automatic Transmission Oil Cooler Thermostat

Automatic Transmission Oil Cooler Thermostat for BMW

Calorstat TO7138.82J is an automatic transmission oil cooler thermostat built for BMW applications that require controlled transmission fluid temperature. It includes a gasket and gasket seal, and it begins to open at 180 Deg. F for temperature-managed cooler flow.

Key Features

• Automatic transmission oil cooler thermostat for BMW cooling system service
• Start to open temperature: 180 Deg. F
• Gasket included for service replacement
• Gasket or seal included for sealing at installation
• Calorstat part number TO7138.82J for direct reference

Detailed Description

This Calorstat transmission oil cooler thermostat helps regulate when transmission fluid is routed through the cooler circuit, supporting stable operating temperature in BMW 528i, 550i, 650i, 750i, 750Li, 528xi, 760Li, 525i, 525xi, 530i, 530xi, 545i, 760i, 645Ci, 745i, and 745Li applications. The 180 Deg. F opening point is an important service specification for maintaining proper fluid warm-up and cooler engagement. If you are replacing a BMW automatic transmission oil cooler thermostat, TO7138.82J provides the fitment and sealing components needed for a clean repair.

This part cross-references URO 17217559962 for the same application.

What It Is Used For

• Restoring transmission fluid temperature control
• Addressing delayed or inconsistent cooler flow
• Replacing a leaking thermostat seal or gasket
• Servicing BMW automatic transmission cooling circuits
• Supporting proper fluid warm-up in colder operating conditions

Installation Notes and Tips

Verify the original part number and match the vehicle application before installation. Clean the mating surfaces thoroughly, inspect the cooler housing and adjacent seals, and confirm the gasket seats evenly during assembly. After installation, check for leaks and confirm normal transmission temperature behavior during road testing. Fits 2008-2010 BMW 528i, N/A; 2006-2010 BMW 550i, N/A; 2006-2010 BMW 650i, N/A; 2006-2009 BMW 750i, N/A; 2006-2009 BMW 750Li, N/A; 2008 BMW 528xi, N/A; 2003-2008 BMW 760Li, N/A; 2002-2007 BMW 525i, N/A; 2006-2007 BMW 525xi, N/A; 2002-2007 BMW 530i, N/A; 2006-2007 BMW 530xi, N/A; 2004-2006 BMW 545i, N/A; 2004-2006 BMW 760i, N/A; 2004-2005 BMW 645Ci, N/A; 2002-2005 BMW 745i, N/A; 2002-2005 BMW 745Li, N/A.

Quality Assurance

Calorstat is an OE supplier to BMW, and this part is listed with application-specific fitment for the vehicles shown above. Use the OE reference and part number TO7138.82J to confirm the correct replacement before service.