okay there can b couple of things too watch and its definatly not the shocks as shocks oil leak wont be seen on dip stick!
most common things are
a) engine packings get worn out so they leak oil
b) look for oil dranage nut below the oil chamber
and none of the above it cause
dey are pullin out the pipe that goes from tappet cover to air fliter after removing it start your engine if there is some smoke there den you got (Back) problem which means your engine is weak
go to a machinic and see what he says!