BMW 6 Series Engine Oil Cooler / Oil-to-Coolant Heat Exchanger – OEM Part No. 11427525333 – Stabilizes Oil Temps & Restores Heat Exchange Efficiency | Fits BMW E63, E64 (2004–2010) & F06, F12, F13 (2009–2018)

Restore stable oil temperatures and protect your engine under daily driving and boost/heat-load conditions with this OEM-style Engine Oil Cooler (Heat Exchanger), designed for BMW applications that use OEM Part No. 11427525333. 

The engine oil cooler is responsible for regulating oil temperature by transferring heat away from the engine oil through the cooling system. When the oil cooler becomes restricted internally, begins to leak, or suffers seal failure, oil temperatures can climb and oil/coolant cross-contamination risks increase—leading to reduced lubrication performance, warning lights, and long-term engine wear.

Common failure symptoms include oil seepage at the cooler housing, coolant loss without an obvious external leak, oil residue around the heat exchanger, and temperature instability under load. Because this component interfaces with both the oil circuit and cooling system, correct fitment and proper sealing are critical.

This replacement unit is built to OEM mounting and flow specifications, designed to match factory hose routing and connection geometry. When installed correctly with appropriate seals and fresh coolant, it restores proper oil temperature control and helps prevent the cascading problems that can come from overheating oil or leaks in the heat exchanger assembly. 

Key Benefits

• Direct replacement for BMW Engine Oil Cooler / Heat Exchanger – 11427525333
• Helps stabilize oil temperatures and maintain consistent lubrication
• Addresses common oil cooler leakage and heat exchanger failures
• OEM-style fitment for factory mounting points and connections

Installation Notes

• Replace all required seals/gaskets/O-rings during installation (cooler-to-housing and coolant connections as applicable).
• After installation, bleed the cooling system properly and verify no oil/coolant leaks.
• VIN verification is required, since BMW cooling/oil heat exchanger configurations can vary by engine, production date, and chassis even within the same series.

FITMENT: BMW 6 Series – E63, E64, F06, F12, F13 (2004–2018) Including

E-Chassis (SWB Platform)

BMW 6 Series Coupe – E63 (2004–2010)

• 630i Coupe (E63) – N52 3.0L
• 645Ci Coupe (E63) – N62 4.4L (where equipped with oil-to-coolant heat exchanger)
• 650i Coupe (E63) – N62 4.8L (where equipped with oil-to-coolant heat exchanger)

BMW 6 Series Convertible – E64 (2004–2010)

• 630i Convertible (E64) – N52 3.0L
• 645Ci Convertible (E64) – N62 4.4L (where equipped with oil-to-coolant heat exchanger)
• 650i Convertible (E64) – N62 4.8L (where equipped with oil-to-coolant heat exchanger)

F-Chassis (F-Platform)

BMW 6 Series Gran Coupe – F06, F06 LCI (2011–2018)

• 640i Gran Coupe (F06) – N55 / B58 3.0L Turbo (where applicable by production date)
• 650i Gran Coupe (F06) – N63 4.4L Twin-Turbo (where equipped with oil-to-coolant heat exchanger)

BMW 6 Series Convertible – F12, F12 LCI (2009–2018)

• 640i Convertible (F12) – N55 / B58 3.0L Turbo (where applicable by production date)
• 650i Convertible (F12) – N63 4.4L Twin-Turbo (where equipped with oil-to-coolant heat exchanger)

BMW 6 Series Coupe – F13, F13 LCI (2010–2017)

• 640i Coupe (F13) – N55 / B58 3.0L Turbo (where applicable by production date)
• 650i Coupe (F13) – N63 4.4L Twin-Turbo (where equipped with oil-to-coolant heat exchanger)

Compatible with both RWD and xDrive variants where factory-equipped

Important Fitment Notes

• Engine oil cooler / oil-to-coolant heat exchanger assembly
• Applies only to vehicles equipped with the factory oil-to-coolant heat exchanger
• BMW oil cooling systems vary by engine, market, and production date
• Excludes M5 models and vehicles with M-specific air-to-oil cooling systems

VIN verification required.

Please refer to the “Fitment” section in the product description for compatibility details.