The Hy-per Lube promotional literature does not mention it having any ZDDP in it at all. Even the Hy-per Lube Zinc replacement additive does not have any zinc of phosphorus in it.QUOTE]
That's why its called zinc replacement.
"Hy-Per Lube Zinc Replacement Additive contains an exclusive Polymer Ester formula, when added to any motor oil, including the new SM rated oils, will provide up to TWICE the anti-wear protection as high content ZDDP motor oils and is also safe for use in all engines even those with catalytic converters "
"Hy-Per Lube Zinc Replacement Additive will provide complete wear protection for cams & lifters in flat tappet cam design engines."
Hy-Per Lube Zinc Replacement Additive contains an exclusive Polymer Ester formula, when added to any motor oil, including the new SM rated oils, will provide up to TWICE the anti-wear protection as high content ZDDP motor oils and is also safe for use in all engines even those with catalytic converters Hy-Per Lube Zinc Replacement Additive will provide complete wear protection for cams & lifters in flat tappet cam design engines.