I always changed my oil by pulling the drain plug. While the oil is draining I check everything else that is on the underside of the car. If you MBZ is like mine nad it has the plastic panels on the underside, without changing the oil by traditional methods, I would probably never have an oppurtunity to inspect the underside of the car. Finding a potential problem or a problem in the early stages VS. finding out about a problem when it is too late, is definately worth getting dirty for. In reality, I get a few drops of oil on my fingers and that is bout it.