flat tappet cam in magnum motor?

i went to advance auto yesturday and saw they sale lucas oil,break in oil.It say right on the bottom it has high zinc in it for flat tappet cams.Its not a bad price.Whats wrong with running a pint of it per oil change to keep from wiping cam lobes?It says to use it for the first 1000 miles,and then use regular oil.