2025 Audi A4 Quattro Engine Oil Filter

In systems designed with one, a bypass valve can allow oil around the filter media when flow through it is restricted, such as during a cold start. Depending on the design, the valve can be in the filter or the housing; its required setting is application-specific.

Package contents vary. One A-Premium cartridge listing specifies that no gasket or seal is included, while a listed spin-on filter specifies a seal. Check the selected part and obtain the correct seal if the service requires it.

An old gasket can remain stuck to the engine when the filter is removed. Installing the new filter over it can create a double-gasket condition and a poor seal, so confirm that the old gasket came off and inspect the sealing surface.

Follow the vehicle's maintenance schedule and oil-life guidance. A filter's stated protection distance does not override a shorter service requirement for time, operating conditions or the engine manufacturer.

The thread is only one requirement. Gasket dimensions, filter size and the required bypass or anti-drainback arrangement can differ. Select the filter specified for the engine and its housing rather than by thread alone.