I changed my oil sending unit 5 months ago and the oil leak stopped. I changed my oil about 5 weeks ago and everything was fine. Today I noticed what looked like some oil spotsin the driveway. When I ran my fingers under the oil pan there was some oil there. What could be the problem? When I changed my oil everything was fine the screw, the gasket, new nissan oil filter, 10-30 Gastrol high mileage oil, aftermarket sender unit. Could one of those things be the culptrit or is it something else? Please help. Thanks, David.