S 600 m275 blown head gasket
Recently I drove a car and I was rolling downhill in C mode without any throttle and suddenly white cloud of smoke start from exhoust, massive smoke, and didn't stop. I assume head gasket is blown bcs coolant level dropped. To be honest I am very scared how fix is going to end. I read several threads where people recommended swapping engine... but threads a bit old so I am wondering is anything changed about this sort of problems.
Do anyone have any suggestions or recommendations, can some sealer help or how much is cost of changing head gasket...
Please don't be rough with answers guys (I know everyone on this site are very kind) bcs as I said I am very scared. 😬😔


