Baywindow Bus Oil Cooler Seal (Seals Oil Cooler To Fan Shroud) - Type 4 Engines

This genuine Volkswagen oil cooler seal is designed to fit around the oil cooler and seal it to the engine tinware on all Type 4 aircooled engines. It is used on Baywindow Buses fitted with Type 4 engines from 1972 to 1979 and on Type 25 (T3) Buses with 2000cc aircooled engines from 1980 to 1983.

The oil cooler plays a critical role in controlling engine oil temperature, and the surrounding tinware is designed to channel cooling air directly through the cooler fins. This rubber seal ensures that all cooling air is forced through the oil cooler rather than escaping around it. Without this seal, or if it is damaged or missing, air can bypass the cooler, reducing cooling efficiency and potentially leading to higher oil temperatures.

Over time, original oil cooler seals can harden, shrink, or crack due to prolonged exposure to heat and oil. When this happens, gaps form between the oil cooler and the engine tinware, compromising the cooling system. Replacing the seal restores the factory-designed airflow path and helps maintain stable oil and engine temperatures.

As a Genuine VW part, this seal is manufactured to original specifications, ensuring correct fit, material quality, and long-term durability. It installs directly around the oil cooler and seats cleanly into the engine tinware without modification, making it ideal for restorations, engine rebuilds, or preventative maintenance.

Other parts that may be required or worth inspecting when fitting:

• Oil cooler mounting hardware

• Oil cooler seals to the engine case

• Engine tinware panels

• Cooling fan housing seals

Using the correct oil cooler seal is essential for proper cooling system performance and long-term engine reliability on Type 4 aircooled engines.

Applications

• VW Baywindow Bus (Type 4 engines): 1972 – 1979

• VW Type 25 / T3 (2000cc aircooled): 1980 – 1983