Big ships and locomotives as well. If a double Breasted Yamaha (Detroit diesel 2 stroke) isn't puking oil, it's broken. Last one I had, you never changed the oil, you just kept adding.
My dad's engines generally required topping off every time we took the boat out, and the transmissions probably went through a gallon of 30-weight in a long day. Makes me wonder how much charter captains spend on oil.
We had aftermarket parts called Airseps. They went on the air cleaners, and the purpose was to prevent the engines from producing their usual fog of oil. The fact that these things were invented shows how bad the problem is.
But people today think a person who spills a quart of oil in his driveway has killed Smokey the Bear, Bambi, Woodsy Owl, and all the other cute forest creatures.
Here's something else that's weird. I can't put a partially used quart of paint in my county's dumpster, but if the paint spills on something and dries, it's legal to put whatever it spilled on in the dumpster. I can't put used oil in the dumpster, but if I clean a quart of oil up with paper towels, they can go, and I'm allowed to throw out used oil filters.
I should point out that where I live, the actual rule the county employees enforce is that as long as it's in a bag, you can throw anything out. They don't really care. I saw a guy putting a lawn tractor battery in the dumpster, and I told the attendant. He was not interested.
I accidentally threw out a fairly large piece of scrap steel on my last visit. I think it got caught on a bag while I was grabbing them out of the car. They have a special dumpster for metals, but my scrap didn't make it. Strange thing: you can throw out 50 steel cans in a bag, right in the regular trash, but a one-foot piece of rusty angle iron has to go in the special dumpster.
An awful lot of environmentalism is just theater.