I have always done virtually all my own mechanical work, but as I am getting older a lot of stuff is getting hard for me to do. I am turning 69 next week and it just gets harder and harder to get underneath my cars for routine maintenance. I do 5000 mile oil changes, so I can easily do 2 or 3 changes in an oil filter. I also change teams fluid every 25000 miles, with 2 cars, that will make my maintenance tasks a lot easier.