Latest advice from Morgan Cars UK:
All Three Wheelers must be started & driven on a regular basis to prevent oil drain back through the oil scavange pump causing engine sump to be over full resulting in oil leaks.
We left ours standing for a few months, resulting in some oil loss. No oil in cylinders (cranked with plugs out to check). However on cranking it did syphon up to the throttle body and spill out the air filter - another known effect and a little disconcerting. No oil loss at all when in regular use.
