M50 w/o double vanos. Oil changes every 3K miles, all services done by qualified mechanic, water pump and radiator replaced at 145K, suspension upgrade done at 145K including bilsteins and H&R and recently new rear rotors and pads along with a valve cover gasket. I live in SoCal 16 mile freeway commute never drive over 4K RPM's garaged and only driven hard in a straight line no real strees on the car. Question is when will the engine need to be replaced as well as the transmission? I am the original owner and have a newborn next month and don't want to get stranded.