Quote:
Originally Posted by choppedliver
I have a 2020 and was told it was normal...I'm sure even on the M5 forums "normal" is the SA response. This is the main coolant tank not the turbo intercooler tank.
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Several guys in the M5 forum have had their tanks replaced. Evidently what happens is there are micro cracks that form in the bottom of the tank where its closest to the hot engine. The cracks expand when hot, slowly releasing coolant and burning off when it hits the engine block.
The problem, as someone pointed out in M5, is there is no heat protection underneath the plastic tank. So even if its swapped by BMW under warranty, it will just eventually come back unless you put a thermal barrier in.
One guy made his own.
I cant believe BMW engineers missed such a simple thing to prevent this.
