Here is a couple of shots of the corner of the cast aluminum oil pan of a GM LS engine. The oil filter literally sits in recess in the oil pan. With the filter in this position, texturing on the external bottom the the filter is super handy to get the filter to hand tight. There is no room for a finger between the filter and the curved wall of the pan. In one case I didn’t get enough torque on a smooth painted oil filter and 5,000 miles later I had a leak. With painted filters I now put a small amount of torque with a cap end oil wrench. With textured oil filters , like Frams, I still use my hand to torque the filter. Others experience?