At this point, just about everyone knows about the big coolant-burning problem with the Ford Focus RS. As it turns out, it’s not a problem with the engine at all, but really a problem with the head gasket used to seal the mating surface between the cylinder head and the engine block. One Focus RS owner had been digging into the problem for quite some time, reporting this problem to a very long thread on FocusRS.org forums. Upon getting his engine apart found that his head gasket was, indeed, blown. But, it’s not the fault of the gasket itself, as the gasket wasn’t designed for the Focus RS – it was designed for the Eco Boost Mustang, as evidenced by the part number cast into the metal portion of the gasket itself.