this engine is new, and has been run less than 8 hours. the leak is coming from an area 3/4" wide, right behind the oil filter. is there a possibility that the screws that keeps the cylinders and crankcase together have been over torqued, deforming the gasket? another possibility is under torqued, but I don't think that is the case. it worked like a charm for the first 8 hours and all of the sudden just started spraying oil. it's not the hydro system. I am sure it is comming from the engine. is there anyway to stop the leak besides putting in a new gasket? the thing that I can't figure out, is why it didn't do this right when I started up, if the gasket was faulty, it should have broken within the first hour. it should have less likely to leak after 8 hours. besides that, the engine was pretty warm at the time, and that should have made a better seal. sigh, time to go around in circles with kohler again.