Ok here I have the intercooler removed on a S55 engine,,,,the customer complained that’s he is losing coolant for intercooler ,,,so I pressure tested the cooling system and found the intercooler is leaking internally.
Here a picture inside the intercooler,,,you can see some coolant condensation on the walls of the cooler.
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bmwtechnician 
I suspect you’re going to see more of these since this leak is getting traction on BMW forums.
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Yes it’s starting to gain traction
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Fantastic plastic!
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The problem is not the plastic,,,,it’s leaking internally where the aluminum core is,,,if it was the plastic we would be leaking on the outside.
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Same issue with Toyota engine/trans coolers. Ends up mixing the two fluids together and blowing the trans. Not a fun thing to tell customers.
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Looks easy to swap out!!
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Looks easy to swap out
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Yes ,,,it not to bad,,,bleeding the coolant can be a pain in the ass once and awhile,,,lol
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was it misfiring ?
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No the car wasn’t misfiring.
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