RisloneHy-per Lube ZDDP Supplement (4405-6PK)

How do you use this oil? Thanks

Can it be used only at break in, then use synthetic oil.

How many oz of this additive are used per quart of oil? And how ppm of ZDDP does that mixture yield, if known?

Can i use this on a 1998 ford expedtion (5.4l v8)? is there a risk of damaging the catalytic converter?