Mercedes Benz cars are rear-wheel drive, which isn't very good for driving in snowy or rainy conditions. The performance can be improved, however, with choosing a snow tire or a model that has the option of 4-wheel drive.

generally this is determined by your insurance company. Most people go by horsepower which is pretty generic. Some people would consider a Mustang GT to be a sport car while others would consider it to be a muscle car. Others would laugh if you were to call a Mini Cooper S a sport car.

Any engine will last several hundred thousand miles given proper care (tune ups, oil changes, etc).