Lucas Oil Additive & a Fresh Motor????????

[Johnny Horsepower]

IS the ZDDP good to use with all older engines. I run %50 leaded 110 in my cars but would like to know if this stuff is worth it. do only flat tappet cars see the benefit?
it will be going in original-
Pontiac RA III and IV 400s
70 LT 1
70 hemi

thanks

John

[lzdick]

Johnny Horsepower,
I run the same fuel in several of my cars and ZDDPlus is in everything of mine that has flat-tappets. It is not needed (a waste of $$) in an engine with roller lifters and/or catalytic converter (damages it). It is made for older motors to compliment the technology of current oils with the ZDDP content of oils sold pre-1989, API grade 'SF' oils. Each 4 oz. bottle contain 0.18% zinc and 0.13% phosphorus...which should be added during your normal 5-quart oil change.