I am looking at a 2015 Hyundai Elantra that has only done 55,000km and I’m thinking of purchasing it. But when the car has run, even for a little bit, when I take the oil cap off there is white steam ...

I recently drove about a thousand miles without my oil cap. It's a 2005 Toyota Sequoia, and I was off-road for about 10 days at the same time. When I got home, no oil ...