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      09-01-2019, 09:53 AM   #5
GearHead335i
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Drives: E90 335i xDrive LCI
Join Date: Dec 2015
Location: Southern New Jersey

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Quote:
Originally Posted by TwinSnailz View Post
Not doubting rednex but my theory is that people/mechanic don’t usually drain(at least halfway)the coolant first while performing the housing gasket replacement. The coolant will go into the oil jacket when you release the 3 bolts to the housing. Which is why a lot of those failures resulting days later and not right away when the coolant is breaking down the oil. Whenever you turn off an engine, the leftover oil film that is on surface will be sufficient for a few seconds during starting and in those few seconds your oil will already be primed.
Well if it makes a difference I drained both the oil and the coolant to perform the ofhg and before I started the car I bleed the coolant system.
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