Many years ago, about the 2005, my sister in law bought a new Fiat Panda 1.2, fire engine.
After 6 months, while she was having dinner with us, I asked her "how is the Panda? Checked oil level?"
"Very nice car", she answered, "oil level? The car is new, it must be ok!!!"
Ok, I took a torch and some rags, opened the hood, removed the dipstick and checked.
"hmm what a engine, very good oil and still clear, I can't see the level.." I watched closely, the oil wasn't clear, it was missing!! Had to add 2 liters to see the dipstick touching the lubricant...