I've changed my own oil since I began to drive. It's not an economic imperative anymore, but it's a task that I enjoy. On a good day it takes me no more than ten minutes, and I have no mess that Gojo in my hands will not clean up. Once I'm done, a very specific task is taken care of for another 3000 miles. That gives me pleasure. My wife thinks it's a testosterone thing. For me, it's a simple matter of frustration. I can do the job in the time it takes me to drive to Quickie-Lube, and I do not have to listen to a nineteen year old grease monkey tell me twenty points that need his attention on my vehicle. I was once that young grease monkey. I know the deal. It's not a testosterone thing. It's a silverback gorilla thing.