Is he human? If so, he is strong enough that if he exerted enough force to lift a car, he would likely crush himself through the car instead of lifting it (especially at that higher strength level). A normal car (we're talking the kind you think of when you think car) weighs a little over a half ton. A truck (pick-up truck) weighs closer to one ton. A fully loaded 18 wheeler would probably not weigh that 8 tons. Note: this is tons. Not kilotons. How on earth are you lifting kilotons of stuff? That's enough strength that flexing your muscles will powder your bones. At kiloton levels, you're lifting buildings. Probably being able to lift a full castle (assuming it was magically protected from being destroyed at the point of lift by pressure) at the 100kton level. but of course, that's strong enough that it overcomes the strength of anything we know of. And that's all three types (shear, tensile, and compressive). If you tried to lift a castle, you'd come away with a chunk of castle rather than the whole thing, for instance, because you'd break the bond between stones rather easily.
An elephant is easy. A gallon of lead is under 100 lbs. Easy for you. One cubic foot of lead is 700 lbs. A shipping container of lead would be easy as well, at roughly 453 tons. A shipping container. Made of solid lead. Osmium is the most dense element at room temp, at roughly twice as dense as lead. If you found enough of it, you would easily be able to lift the mere 900 tons. Or .9kton object. after actual calculations, you would barely not be able to lift a castle. Might be able to do a keep (but I couldn't find numbers on an average keep size), but the walls are generally around 4Mtons. That's about 5-6 times more than your max. So here's where it gets interesting: you could push a castle.
There's just not much in this world that you either can't lift or have a hope of lifting. Everything is either easily lifted by you or will fall apart if you try to lift it. The primary concern is grip and pressure, and I'm certain you could exert more pressure than is needed to crush anything, including yourself when you try to crush stuff. So look around. If it's a free object, you can lift it. if it's not a free object, you'll destroy it trying to lift it. And if it's a free object, you still might destroy it trying to lift it. You rob banks by literally robbing a bank. As in, grabbing the building and running off with it.
