My poor old 2.25 diesel has just failed its mot.. I had a little play and gave it a bit of a run today.. noticed a few odd things recently like revving and settling back to idle all on its own and just randomly dying.. whilst I was out on the run the oil pressure light came on and when back off.. when I got back I popped the bonnet and it had blown oil every where mainly from the rocker cover.. I'm guessing the rings are passing and its pressurising the sump and the revving when hot is it running off of its own fumes or oil.. any other input??