First I had to get the cap off. The cap that was so hard to turn that I kept thinking about the time I got a flat and the lug nuts were rusted to the wheel. My relief at freeing the cap was short lived because then came dropping the oil cap into the engine. And, no, when you drop something into the engine it doesn't necessarily just fall through to the ground. It didn't fall to the ground either of the two times I dropped it. Thankfully the funnel worked as designed, I didn't spill any oil at all. Except for the bit from guessing wrongly which way the valve opens. It wasn't a lot. Nowhere near what happened with the Exxon Valdez. I swear.
Anyway, the thing got done. The oil is in the engine and the dipstick proves it. The engine warning light in my car is off. For now. If it ever comes on again, I'll be ready. After all, I've got a box of oil in my trunk.
P.S. If you look under your car's hood and look at the oil cap. You just might find the type of oil printed right there. No need to worry if you don't have access to the Google machine. Not that I use Google.