BMW superseded the 2 oil lines for this oil cooler for E9X M3’s built up to 3/2008 and require the use of the current spec BMW oil lines. If you have an early model, you will need to change the engine oil cooler lines and O-Rings to the later style. CSF’s E9X M3 Oil Cooler (#8025) was designed to use the later model oil cooler lines. For this oil cooler to fit, make sure you have the following oil cooler lines and O-Rings.