Evening all I got a bit concern this morning when I had to add oil to my 320 ML163 and when lifted oil filler cap and there was quite a bit mayo. Vehicle is used on short runs - avg 10-15miles which I know is not very healthy for motor. But I know for fact it is not loosing coolant (I think) and it not overheating either. It is possible that it got condensation over long period of time? Should I be getting ready for checking head gasket?