When I had the oil pressure light it happened on the motorway, I think the reason the balance shaft failed is because I mixed oil with different brands dump mistake of me. Had to get the Balance shaft fixed by buying a kit which is a conversion an also had to buy a new turbo as there was no oil going to the turbo meaning kaboom, My turbo started to smoke up when it happened. The balance shaft kit only cost me around 200 pounds and its definitely worth it.