Wow!! Really? Damn it!!! How does that happen?
Evidently the glow plugs go from ambient temp to 2300 degrees in 2 seconds.....they are close enough to the exhaust valve to it can cause damage to the valve over time from heat stress, there is a reflash that modifies the glow ug operation to supposedly fix this, the melted piston thing is #8 piston overheated due to EGR filter plugging I guess. I just know it's number 8 piston. Ford seems to be stepping away from covering these issues under warranty claiming lack of customer maintenance in most cases.