I don't think this works either. Marcus is a very experienced Vincent rider and when he started the run his oil tank would not have been overfilled, or, one would assume, not even filled to the lower end of the oil filler tube. Consider that the oil tank contained, let us say, three pints and that there was a further one pint lurking inside various parts of the engine (the filter housing holding most of that), then no matter what happened to various pick up points there cannot be enough oil in the system to over fill the tank. Remember that Marcus had already covered 50 miles. If that is accepted than my guess is that air must have been being fed into the oil and aerating it to the extent that it foamed and increased the volume. Once again I do not see how the oiling system can do that but neither can oil be created from nothing. ( I am assuming that Marcus does not have some arrangement with Cornish fairies to produce oil for him in exchange for a glass of milk at night.)