2L of oil in 5000km is WAY TOO MUCH !!
You must be burning or leaking oil somewhere.
Maybe the valves, head gasket or piston rings are too worn.
Are you sure it's not leaking anywhere ???
You clutch problem is that it is "Dragging".. It is not disengaging properly.
Either the cable does not have enough slack or the actual clutch basket is "notched" or the plates are warped. It needs to be taken apart and checked properly.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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