Cowboy,
No, the thing your wife uses for french fries is a deep fryer. This gets way too hot! A crock pot is a slow cooker. They generally have 2 or 3 heat settings but generally don't get anywhere near as hot as a deep fryer. And remember, you can't just borrow your wifes cooking stuff because the antifreeze will permanently poison it. Once used for engine cleaning, it cannot be used again for cooking. Unless your not overly fond of your wife...

Just kidding, just kidding!