What's the difference between AWD and 4WD? I was handed the keys to the brand new BMW M5, which can actually switch between 4WD and 2WD! Nothing all that impressive for any truck drivers out there ...

Dear Car Fix: I just bought a 2010 Honda CRV with four-wheel drive. I was told it isn’t really four-wheel, more like all-wheel. I had a four-wheel drive Blazer and ...