You can teach yourself how to change the oil on your car simply by watching YouTube videos. And then all you need to buy are a few basic supplies, and you'll be able to change your oil for life. Oil changes are either absurdly expensive (dealership) or done half-assed (Jiffy Lube), so doing it yourself gives you a job done right for pennies on the dollar.
And if you find that you have a knack for it, you can teach yourself more basic maintenance jobs like changing brake pads.
I took more stupid long to realize you bought 20 qts of oil from Costco And not 5. Guess I need to learn that mental math stuff from earlier in the thread.