Anyone else who has a built motor and a similar setup than mine have severe carbon build up? My shop keeps telling me this is normal to have severe carbon build up and to eat oil frequently! What are your takes on that? I understand a built motor is going to produce carbon more and eat a little oil, but damn, this much carbon for just a 2-3 minute startup? And it's eating oil like crazy but no leaks or anything dripping on the ground.