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      04-03-2013, 12:53 PM   #4
jakuum
Private First Class
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Drives: SGM e92 335i M-sport
Join Date: Feb 2011
Location: DFW

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2011 BMW 335i  [0.00]
From ECS tuning:

The coolant expansion tank in your vehicle gives additional fluid a place to go after expansion and contraction from temperature change. Because it is subjected to such drastic changes on a regular basis, it can often crack or break. You want to keep all the coolant in your vehicle in the cooling system. If your tank has experienced damage such as cracking, nipples breaking off, or mounting point damage, you will need to replace it.
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