This a basic 8.5:1 motor, it was sort of a spare. Here is the story. This engine was the first one I bought it smoked white all day. I thought it was a headgasket and I had the company send me another motor. I put in the new engine and had the same exact problem. I troubleshot some more and found out that my o-ring on all 4 fuel injectors were toast and was mixing with the lubricant (from the company) in the engine so it wouldn't burn it all out. I believe the first engine to be good. I'll let it go for $200. if not I'll probably buy another sentra and toss this engine. you can search on my username and see the history.