I work in the commercial baking industry and once we had a big azz gear box going bad but we couldn't get a new one for a week so we added a gallon of Lucas every 8 hrs so the seals wouldn't blow. It worked but don't go putting crap into a brand new motor. It's not necessary and is a waste of money. My 95 GT went over 300k miles on Castrol GTX 10w30 and a Fram filter. It lived most of its life in a place with more dirt roads than paved and it was still running and didn't burn oil when it was rebuilt. Don't tell anyone but my secret was/is changing regularly.
Looks like I picked the wrong week to quit sniffing glue.