If you're working on your car's engine and need to remove a rounded sump bolt, there are a few different ways you can do it. First, try using a ratchet with an extension and socket that fit the bolt. If the bolt is really tight, you may need to use a breaker bar instead of a ratchet. If the bolt is still stuck, you can try heating it up with a torch. Put the flame on the head of the bolt for a minute or two until it's hot to the touch. Then, use the ratchet or breaker bar to loosen it while it's still hot. Finally, if all else fails, you can drill out the head of the bolt and replace it with a new one.