E36 M3, E46 M3 and Z3M/Z4M all have an oil cooler and oil thermostat. It closes oil flow to the cooler until the engine is warm. After the engine has warmed thermostat opens but even then only a part of oil flow is directed through oil cooler which makes these cars run pretty high oil temperatures on track.
This oil diverter valve does not restrict oil flow through the cooler like thermostat does making oil temps on track lower by 15-25 deg C with the same oil cooler.
Suitable for these BMW:
- E36 M3 - Euro
- E46 M3 - Euro and USA
- BMW Z3M (S50 euro engine and S54 engine)
- BMW Z4M (S54 engine)
- Other BMW engines with S50/S54 oil filter housings fitted