Need advice on motor replacement?

2010 F150 Supercrew cab bought used from a dealer in Nov 2015. Paid approximately 11K w/$7k on lien. As is no warranty.did not purchase a warranty. 6 mos and $500 tune up/$450 repair engine is gone. $8000 for replacement with rebuilt. This is my son s who is fresh out of college and trying to make it on his own. Money is a problem for us both right now. He says he should borrow the money to fix it because either way he goes he is going to be upside down. 3 year unlimited mile warranty on the rebuilt through ford dealer. Any advice?

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