What causes oil to leak into coolant and coolant into the oil and the solution? on 2004 Mercedes-Benz C230

Was put on the rack (under pressure)July, 2011, couldn't find leak or evidence of leak. Every 2-3 weeks, check coolant message would appear.

by in Houston, TX on December 29, 2011
1 answer
ANSWER by , December 29, 2011
blown head gasket