I wasn't talking about crusty.. but when you want to take off wheels etc, there can be expansion when something is hot from driving. And yes your car is 100ft lbs for torque... one day you might want to help a buddy with a truck or something. I came across one crank bolt that sounds like the brother to the one you fought. That was one out of probably around 100 or so.
My cheapy 1/2 impact (air) will do 600R and 500F. As you use stronger guns you need to work the throttle and not simply squeeze the trigger and go for broke.