Alright ppl
Right where do i start. i did a daft thing and changed the oil but i used 0w40 (way to thin!!!!) changed that and started the car and it was dead smoky on tick over(wasnt before the change). So i drained the oil back out and changed the filter again but used the right oil. Car seemed fine after that (small amont of smoke guessing the thin stuff that was left burning away) car was fine for a week or so. Parked it in the garage after it had been runing fine and the next day when i started it there was so much smoke u couldnt see.

What could this be rings, seals, etc??

any help would be great.