Just in case this is not a leaking seal issue, you might check the oil pressure sending unit. Quite often with age and the beginning of winter the plastic on the sending unit can begin to fail around the crimp. Since this is pressurized motor oil a leak can get somewhat nasty.
If this is the case then it’s a cheap fix. Just something for consideration.
If this does turn out to be a crank seal issue then the crank journal should be inspected for a wear groove caused by the seal. If there is a groove then a Speedi-Sleeve is recommended to keep the new seal from leaking.