Okay, got a plan... I popped off the grill and sprayed the remote oil filter lines and oil pressure sending unit real good with brake cleaner to remove all the oily residue and let me start with a clean slate. That is a hint already, in that the oil lines were new last fall (the originals rubbed through and leaked oil), and they already were covered again with an oily/dirty mess. Every thing is clean now, I'll check again after the next mowing. I've had an old Lincoln and Mopars over the years that have made big messes from leaking oil pressure sending units...