I AM USING A GOLLON OF ANTI FREEZE A WEEK.
Dealer has replaced water pump, heater core, and multiple hoses. Thank God for Warranty. Issue started at about 40k I now have 77k and they can not resolve the problem. Help!!

 

Find another dealer.

 

Two different dealers

 

It sounds like the engine is using it during the combustion process. This is caused from a failed head gasket.

 

And/or failed turbos. The EB turbos are cooled by engine coolant and the seals can be toast allowing the coolant to be sucked out the exhaust.

 

 

Good to know.