yeah, I gave it a good wipe to look for any cracks. It seeps all the time at a very slow pace but even more so when it’s running and warmed up.I see a fine crack, but you must have cleaned it well before this picture. Does it continue to seep all the time or just when running and the engine warms up?
I was thinking the same but not as extensive of dremmeling out the crack a bit. Didn’t think of doing that.The correct fix is a new case and all that involves.
The possible repairs are welding or epoxy.
Being cheap with a dash of shade tree crude, I'd go with high temp epoxy.
The method I would use is to drain the oil and pull the filtter, route out the crack a couple of mm deep (not too deep as the case is probably fairly thin) with a cutting wheel on a rotary tool (Dremel or copy).
Then I'd clean the hell out of it with brake cleaner and apply high temp epoxy following the manufacturers instructions.
Next day I'd put on an oil filter, refill the oil and enjoy my ride.
That next night I'd put a sheet of clean cardboard on the floor and see if anything was leaking.