my 96 3.8 keep shredding the oring that goes around the thermostat and im not sure why. i want to blame the problem on cheap felpro part. anyone seen this before or know whats going on? its the second one in less than a year and now i think its clogging coolant passages in the head gaskets. its a motorcraft t-stat from ford dealer but the edges did seem a bit sharp when i inspected it. any idea please.