There were at least two that I know of that had the rubber seal disc in the cap drop out and cover the suction line hole in the oil tank. Oil starvation ....melted engine. I must admit it is not a common problem and you don't really need to know what is happening to the oil temperature and pressure but I like to know. It is very reassuring to see the oil temperature falling when the cooling fan cuts in on a hot day stuck in heavy traffic.
