Ok so I've decided to not give up on my sentra and I am going to put a new engine as my cat broke up and got sucked in. Current Status : I am burning oil but it turns on fine and runs. I live in Miami so i need help getting a brand new engine or should I say a used one. I have a 2002 Nissan sentra SE-R which i believe is a B15 and has a QR25 motor. How much will it run? and how much will it cost to install? Where is the best place to get one? craigslist? ebay? junkyard? please help.