I was at that same frustration level after several gaskets and a cast aluminum pan, replaced the dipstick with the Chebby style - Finally figured out with some spray cleaner and a bright halogen light that the tail shaft gasket right above the back of the pan was seeping and running all the way around the pan lip to drip off the front of the pan . Got that fixed and put the pan back on with the silver Permatex silicone and no gasket- hasn't leaked a drop since...