How long have you had the bike? If it is new it might be the silicone sealant Ducati uses when putting together the engine. If the silicone wasn't applied properly some oil might leak out. Don't know why they use silicone instead of a rubber gasket..
I cleaned it out yesterday, rode it today and it's back. It's not excess chain lube, and my deep sump is tight. It's not coming from the sump end though it's coming from the radiator end. It's not coming from the breather pipe either it's just running down the side of it and escaping at the bottom. There's plenty of oil in the system, not over full either. So I don't know
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