Will Luca oil work as a temporary soulution to a damaged engine(2003 mustang gt?)

It might buy you a few hours or a few days. Just depends how bad the engine is damaged.

You will know if its working by how fast your oil levels go down. you may also want to use break in oil , then change it after 100 miles then use the Lucas.. give it a shot.. let us know how you make out

Try to find some MOTOR KOTE,they sell it at most auto parts stores. It's the only thing, that i would try, to give you a little time to find, or rebuild your V8..... hope this helps