Diesel Bombers - head gasket/turbo

I have had a good bit of help on here all leaning towards gaskets its on a 2000 k 2500 6.5td yes the upper rad hose is pressurized as soon as I fire it up but no water in oil never over heated it does loose coolant out the tail pipe smokes like hell. But I was told it could be turbo instead of head gaskets please help don't want to buy something I don't need. I just want to get this dam truck running sucks looking at it parked in the garage and walk by it every day please help:argh: