2015 ecoboost 2.3 mustang engine failure. dealer says sparkplug broke
I have a 2.3 turbo ecoboost mustang year 2015. The engine failed on me while I was driving around a corner. I checked the oil dipstick and it was flooded, way overfilled (most likely coolant leak?) the engine oil fill cap had white milky residue on the inside of it. The car wouldn't start. I had it towed to the Ford dealer. Today, they tried to blame aftermarket spark plugs for the engine failure, even though the plugs that were installed were highly recommended for the 2.3 ecoboost. They said the spark plug broke and there was a rod broke laying in the oil pan. The vehicle seemed to experience either a head gasket failure that led to hydrolocking, or it spun a bearing and threw a rod (just my opinion). How likely would a broken spark plug cause engine failure? the spark plug in question was still in the spark plug hole, but it was broken, this is Ford's claim. Every mechanic I've spoke to, claims spark plugs hardly cause engine failure when they break. The vehicle seemed fine until I heard a quick loud knock and a dragging sound accompanied by white smoke from the back of the car, within seconds of this, the car shut off and refused to start. I have had pinging and light knocking in the engine at higher rpms off and on for at least 1 month prior to the failure, as well as a missing at idle no matter if the engine was cold or warm. and I told Ford about the issue and they claim the engine was fine every time I complained about engine noises. what do you think caused the catastrophic engine failure ?