could be box oil??
If it is the crank seal, the spring may have rolled off the back of seal lip, they do that very easily. Then, the seal can pucker or lacks grab and can weep.
they can get nicked on a scrap of rust as they slide onto the crank...
The clutch should survive as the oil doesnt get thru the flywheel.
If u try a marigold glove over the oil filler - tether with some strong bands around fill neck.
It will inflate but shouldnt keep going or blow off.
You could mod a scrap filler cap with a 1bar clock from the bay. I started this but didnt need.
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