I change hot. Also change the oil filter last, after punching a hole in the lowest part of the filter and letting it drain. Also have a FUMUTO valve on hand to replace the oil plug the next time I change oil. This will allow puttting a 1/2" hose on the valve and draining into container without getting oil done my arm or all over the driveway. After the filter has drained thru the hole I punched in it, I slip a plastic bag over the filter to catch most of the drips when the filter is screwed off the post. Duramax filters sometimes are real tought to get off, use a good replacement filter. Baldwin, Wix or NAPA Gold are good. There are others to .