[Daves55Sedan]

You can laugh if you want to, but I always save old socks that have developed a hole in the heel and I just cut off the top part of the sock and slip it over the road draft tube so that the toe end is about one inch below the bottom of the tube. The sock is held in place with a zip tie around the tube
The sock catches what little oil drippage there might be and also seems to filter out the worst of the smoke. I change the sock as needed when I happen to be doing an oil change as they do get pretty nasty over time.