This is something I have never practiced before, until today. I will be changing the oil on both cars in my sig in the next 300 miles or so. I have some M1 HM 5w30 for the Uplander, and M1 AFE 0w20 for the Accord along with two Fram Ultra's, one for each car. I examined the oil filters as usual (got them off Amazon this time). The XG 7317 looked ok, but the XG 3387a for the Uplander had some oily substance with black particles on the mounting plate. The oil is alright as I am sure they spray the base plate with oil before packaging. However, those black specs should have not been there. So today I cleaned both filters with a Q tip and some isopropyl alcohol. You would be surprised how much dark crud came off of both! This is something I will do from here on out.