2000 - Leaks Oil Badly

#1
I have a 2000 corolla with 261000 kms on it and is leaking badly. I'd say its burning but no smoke of any kind and I've never noticed a smell. No puddles when I parked and I just replaced the pcv valve. It is using about a liter for just over two hours of highway driving. Trying to figure out what the problem is and how much the fix would cost. Would hate to get rid of it because its unreal on gas but I need to know if its worth keeping or not.
 
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