Engine oil and transmission fluid mix-ups - how common?

Most garages know what they are doing. BUT Quickie lubes you are luckie if they even put the drain plug back or oil back. That is one reason they are called quickie jiffie lubes.:grinyes: :rofl: :lol: MT

One legitimate garage forgot to put oil in my friend's engine and ran it for almost a minute before noticing this. They pulled a head and found some scuffing and ended up installing a rebuilt engine. This was normally a good garage, and they had the class to install a GM crate engine, not a cheap rebuilt or used one, as Wal-mart has been known to insist on when they've made this kind of mistake.

I normally do all my own maintenance but may be moving to a place where this won't be possible, and I wonder if garages that accidentally run engines or transmissions without oil add the oil and don't admit anythign to the customers.