I second this! I would recomend that potential buyers follow these instructions.
Blown Head Gaskets are very expensive to have replaced. I am an experienced ASE master tech and I repair alot of headgaskets. The Legend is a tricky one to diagnose, so taking it to a mechanic for a check over will not guarentee that the car does not have a BHG. Being hard to diagnose the BHG is one thing, but repairing them is another. It is a long process and books out around 10 hours + parts + machine work usually ends up being around 2 grand.