For cars built around and prior to 03/08 you may need to upgrade your oil lines. BMW superseded oil lines on early vehicles and they are physically different. The CSF oil cooler is designed for vehicles with the later spec lines. These oil lines are available direct from CSFor from your local BMW dealer.
Early Cars - Will not fit part number CSF-8025
HOSE 1- 17222283417
HOSE 2 - 17222283418
ORING - 2 x 17212283511
Later Cars - Will fit CSF-8025 - Part numbers supplied as a kit
HOSE 1 - 17222284077
HOSE 2 - 17222284078
ORING - 2 x 17222284079
with your VIN to see which oil lines your vehicles may have.