phone call, help i have an oil leak

That's actually a mistake even the seasoned mechanic can slip up and make. It's not too hard to do. If you are tired, in a hurry, distracted......we're all human.

You bet. "In a previous life" when the oil-change shops got started, I sold auto parts. A couple of those shops had to buy engines for customers.........oil filter mistakes, wrong filer, not tight and fell off, etc etc