Just use radiator coolant. Use a small electric pump suck up cold liquid from the lower hose and dump it into the upper after the air/water heat exchanger. It works just fine on MB's current M157 engine.
http://www.mercedespost.com/wp-content/uploads/2010/03/762693_47_3508_10A213_medium.jpg
Very compact setup
http://www.eurocarnews.com/media/pictorials/314/1933-web.jpg
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CENSORED due to not family friendly words 
Last edited by tjts1; 10-17-2012 at 10:04 PM.
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