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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Burning oil and oil in coolant expansion tank



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      10-26-2020, 12:32 PM   #1
jmiske4
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Burning oil and oil in coolant expansion tank

I have a 2008 bmw 335i convertible n54 engine I drove my car to school a couple days ago and burned a lot of oil about enough to bring up the check oil light in my car. I go to start it this morning and it brought up the check coolant light and checked the coolant expansion tank and there was no visible coolant and I looked down inside the tank and found a dark chocolate like substance I'm thinking it is oil but I'm not sure how to go about it because Im going to do a coolant flush and see what it might be and don't want to start the car without knowing what is wrong
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      10-27-2020, 09:59 AM   #2
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Probably needs the oil filter housing gasket replaced.
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      10-27-2020, 05:51 PM   #3
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Yep. Sounds like your OFHG is probably gone. You can probably see oil/salt residue pooling below the intake manifold.
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      10-29-2020, 12:13 AM   #4
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I had a dealer replace the ofhg before I posted this and I feel it might be residue oil but still so confused on the coolant
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      10-29-2020, 03:28 AM   #5
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The OFHG has both oil and coolant passages. If the gasket between the oil and coolant has failed, that could be the source of the 'gunk' in the expansion tank.

I literally just replaced the oil cooler on my other halfs astra last week, same symptoms as you (oil in coolant) replace the cooler and no more oil in coolant.

I would have expected them to do a coolant flush if they replaced the OFHG though?
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      10-29-2020, 06:12 PM   #6
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Quote:
Originally Posted by jmiske4 View Post
I had a dealer replace the ofhg before I posted this and I feel it might be residue oil but still so confused on the coolant
If the OFHG (which is a very thin gasket) goes, oil has the potential to be mixed with coolant since the gasket is both for the oil and the coolant going through the oil filter housing. Just watch a video on how to change it and it'll all make sense.
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      10-31-2020, 05:35 PM   #7
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I figured it out I'll need to do a coolant flush and throw some distilled water in it first then fill it with coolant after but thank you to all the people who commented and helped me understand if I should do anything different please let me know
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