To change the filter on the 5.3’s with OEM UCP, place an aluminum shallow baking pan on top of the UCP under the filter. Then, punch a hole in the thin baking pan over the main drain pan. Loosen the filter, wait a few minutes and then slowly remove the filter and tilt it over the aluminum pan. The pan will catch the oil which will drain into your main drain pan and not all over your ucp. The longer you wait, the less mess you have! Also, I drive the rear wheels onto ramps instead of the front wheels for two reasons : 1) The oil will drain from the pan without hitting the differential crossmember. 2) The drain plug sits to the front of the pan giving less old oil in the pan.