Assuming the $10k leak you are referring to is the timing chain cover, no one in their right mind is going to spend $10k on a very minor leak like this on a Macan with this much mileage. As many have pointed out, the answer would be to just let it leak. Unlikely you will ever need to add a quart of oil between changes because of such a minor leak.The car could be perfect and never give you any trouble, or the car could already have a leak which is $10k out of pocket.
And any thorough PPI will discover the leak, and the buyer can use it as a bargaining chip.
Finally, a number of owners have provided detailed instructions on this forum regarding how the leak can be repaired without engine removal at a cost that's a small fraction of the $10k you mentioned.