Quick story from an old coworker...he swore it was a true story, but funny either way...
Old coworker who was a mechanic for a fair number of years; lady comes in with car running poorly and smoking like crazy. She had concerns about the oil. She,said it must be loosing a lot because of how much she had to put in...she said she kept having to buy more and more oil to get it filled up.....
Apparently...she thought you filled oil like you would fill wash fluid or a radiator...she bought a bunch of the big jugs and poured into top of engine till full !!!!
Now, idk if true story or not....but it was was a pretty funny WTF story when he told it.