why is oil mixing with coolant in coolant tank

Thanks for accepting me. I have a problem my bmw 2006 e90 is mixing woter and oil in the woter bottle help me guyz plz

My 2003 X5 has oil in coolant,but not water in oil . I started to pull the cylinder head,but remembered that wife said the transmission was acting funny. I drained the transmission fluid it was almost gone and mixed with water. Check this first before you pull half the motor apart like me. The only place it can get in is the cooler.

My e90 had the same prob....oil in the coolent... I replaced the oil cooler and fluched the hole sytem..i olso replaced the oil valve separator...runs great now ...but i check every week

Hi guys Its truly helpful,I've experiencing the same also, my moves well but there's transmission in a coolant water bottle ,so I want to flush water bottle ,oil in engine, gear box transmission also

I had sam problem with my 320i m sports. I had two reasons for this problem 1) engine cooler 2) transmission cooler I changed them and flushed all of my fluid and coolant. Now it runs excellent

Guru, you did it yourself or you took it to someone

Oil Coolant and gasket

how to flush the oil off the radiator?

Why my oil mixing wit coolant and coolant tank

Because of gear cooler leakage or engine cooler. Depends on what kind of oil is in your coolant tank