Review on Hy-Per Lube By Rislone ZDDP Supplement (4405-6PK) by Darrin Lucas

I've been using this product for more than 30 years and it is especially important in Classic Car's high performance engines . Zinc use to be in the older oils but in the newer ones it was reduced or eliminated. For Classics and Antiques original engines MoBile 1 will leak through due to engine tolerances. My experience with original and rebuilt older engines even those that have changed gaskets, diaphragms, and other materials still have some type of leaks because of the viscosity of the synthetic oils. Adding Rislone is just replacing the zinc back into the newer oils which helps coat and adhere to the mechanical parts of the engine. Very Good product in my opinion.