I have a 2000 45 td that I only use off road. It recently wouldn't turn over which proved to be a seized alternator - sorted that out and got it started after a lot of effort. I ran it for about five minutes before I realised that there was no oil in the sump because the drain plug was missing, it then stopped a bit sudden. I left it for a while then put some oil in. It turned over but wouldn't start, now it won't turn over. Is there any hope for it?