2015 SCION FR-S Electrical System Problems

Defective engine/motor failure spark plug popped out of engine along with coil. The service technician and service manager were shocked at the spark plug broken internally. I paid for spark plug replacement totaling approximately $1,200. Upon inspecting other parts of the motor it was determined the engine bay has coolant inside mixed with oil. The tech mention of engine over heating however the temperature gauge never reached overheating readings. If the engine overheated the temperature gauge failed to alert me while I was driving at any point and expressed this to the service advisor. My vehicle motor failed while I was engaged in driving on the freeway and turn off and on in the middle of flight and travelling at freeway speeds. I originally purchased vehicle at Long Toyota USA in El Monte, CA with zero to 15 miles brand new in 2015 it is less that 10 years and...