why is oil mixing with coolant in coolant tank

Asked by Feb 18, 2014 at 05:05 PM about the 2006 BMW 3 Series 320d

Question type: Maintenance & Repair

2006 bmw 320 msport

5 Answers


The oil filter housing gasket usually fails around 40k-60k and oil then leaks into the coolant.

32 of 32 people found this helpful.

Sounds like an intake manifold gasket, head gasket, or cracked cylinder head. I'd have it diagnosed by either BMW or a service facility that specializes in imports. Don't take it to a run of the mill garage. They'll have no idea of what they're looking at!! HTH. -Jim

4 of 4 people found this helpful.

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

48 of 48 people found this helpful.

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.

6 of 6 people found this helpful.

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

2 of 2 people found this helpful.

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