[xichrisixBMW]

Heads up mine was leaking on my 2011 335i @ 70K miles ; tech at BMW dealership reported that oil had leaked past the gasket into the cooling system and contaminated the coolant! The gasket was replaced and the complete cooling system had to be flushed with detergent, then water then refilled with antifreeze.... Adviser said job was quoted @ $1200 but adjusted to $500 due to BMW goodwill. Now warrantied for 2 years / unlimited miles. My advice is to N55 owners is to preventive replace! Don't wait for cross contamination!!