Also, the M20 engine is a 'dry sump' engine so under normal circumstances there should only be a minimal amount of oil in the sump (crank case), with most retained in the oil tank...
The 2 pints you drained from the engine is what has slowly leaked from the oil tank, through the oil pump and past the anti drain valve to the sump while the bike has been standing unused...
That's what people are referring to when they say an engine has 'wet sumped'....Ian
