Its not good. I am 90% sure my motor is seized. I was driving just fine. I did not rev it past 4000rpm. And i torqued everything down to spec. I was driving and it seemed like a cam gear slipping but i knew it wasnt this time. I was pulling onto the shoulder when my oil light flickered at me then not even enough time to look up at the road i heard something grind then my motor stalled completely. But in drive it did not lurch or jerk the car when it seized up. It just sounded like a smack and it died like a bad tps sensor makes it die... So i put it in neutral and coasted into a parking lot where my car is now sitting with a no crank issue. It clicks like a starter gone bad... Just it has additional noise like a smack in a way. I removed my oil cap and a lot of smoke came out of it. My oil is grey but no debris on the dip stick. Hopefully it is just the heads as crappy as that sounds. Because as long as the block is good i can fix it... This sucks. Big time... But i will pull it apart tonight with my construction lights and see what happened and where and what broke. Any ideas? Could a primary cam sprocket fail causing the motor to seize? Could a timing chain guide break causing this? Could this be timing chain tensioner related? Could the knock sensors have caused this since they were broken? What about oil pump failure? Do they fail on our motors commonly? Where would you start?????