Thats a good assumption that makes perfect sense but its actually a 3.0 petrol. D is just one of my initials

Hi everyone. Bought a mega cheap e53 X5 sport as I've fancied one for years. Working my way through various issues. I've resolved a few of them but I have developed a rattle which I suspect is the timing chain. I only hear it when I come off the throttle and the engine is slowing down. Its absolutel...