BMW Questions? Ask a BMW Repair Expert for Answers.
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unfortunately that points to a blown head gasket (or worse - cracked head or block).
this is consistnent with coolant loss without a leak as the coolant would be consumed by the engine.
you should have testing for a breach of the cooling system carried out immediately to verify the cause. If you need a new shop check out www.bimmershops.com or www.bimrs.org for options
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