Installed new hose and coolant level sensor last Thursday and used MB coolant and tap water.
Test drove on short trips this weekend prior to commute this morning. No overheating, so I guess the head and gasket are still sound (knock on zebrano)...
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car