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      08-16-2010, 09:52 AM   #11
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Drives: 335i e91 LCI msport
Join Date: Jul 2007
Location: Lincolnshire

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If you do have the catch can done along with engine flush etc. I would also ask for your intercooler and IC piping taken off and flushed also. This is where a lot of oil will have collected and may well be having a detrimental effect on your cooling system - particularly after 50k miles.