I reached a point where I was burned out on changing my own oil, BUT I was doing 14 vehicles once a month, plus a few more. I'd tell my family, friends, neighbors, co-workers "third Sunday this month!" so I'd usually have four or five other people show up in my yard with their Supertech and Frams in hand. So, on average, 20 oil changes a month 12 times a year, I was doing 240 oil changes a year in my backyard. That's a pretty good bit for someone that doesn't work at a garage or shop type facility. I ended up running Schaeffers for a while to cut down on intervals, so that helped until I shut down my cab business.
Now, 22 oil changes a year in my back yard, I can live with that. No burn out here!