So gents my 2006 Jeep commander (55k miles), which I bought new, its engine blew. My mechanic said something about the valve dropping and blow out the valve cover and bits of metal going into the block. My mechanic says I need a new engine. Estimate total cost $4500. Does that sound about right. Also since I have to get a new engine are there any performance V6 engines out there that would be an easy swap in for about the same price. Any comments suggestions would be very appreciated.