There's certain projects others might DIY that I don't out of fear, changing the oil isn't one of them. I still change the oil in my old truck that I don't drive much, it's just easier and and by the time you buy the oil and the filter, you're saving a minute amount of money, and if your time has any value, you're losing money.
I won't tackle any plumbing job that requires sweating copper lines because I haven't done it much and I'm not confident in my ability to do it right, and I'd rather pay to have it done right than me do it and potentially fuck it up.