Hello together On my son’s 5s either the seal ring of the coolant sensor or the seal of the return hose is minimal leaking. Could I not locate exactly yet. Does anyone know the size of the seal ring of the sensor? I don’t see how to change the complete sensor for a 5ct O-ring. On the old Z4 it was 10×3. Maybe it’s the same with the E60. How are the return hoses fixed to the cooler? Are they only plugged on and there possibly also an O-ring?