Thread: What's this (B48)?
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      02-15-2018, 10:24 PM   #1
mleskovar
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Drives: '18 230i
Join Date: Dec 2007
Location: Huntington Beach, CA

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What's this (B48)?
Can't find any reference in my manuals to the coolant reservoir next to the main/engine coolant reservoir. I'm curious, anyone know? Turbo cooling? It's the smaller opening in the pic.
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