DO use http://zddplus.com/ to get the zinc the oil needs. i have a case coming. 24 bottles $189. just a little less than $8. ea. what is your engine worth?
"I’ve also tested ZDDPlus zinc additive in 3 low zinc oils, and I’ve tested Edelbrock Zinc additive in 3 different low zinc oils. In each case, the recommended amount of additive was used. And in all 6 cases, these high zinc additives ruined the oils and made them WORSE than they were before the extra zinc was added, by SIGNIFICANTLY reducing their wear protection capabilities. These additives did the opposite of what was promised. That is not surprising, because most major Oil Companies say to never add anything to their oils, because doing that will ruin the oil by upsetting the carefully balanced additive package that their Chemical Engineers designed into them. And that is precisely what was seen when using these high zinc additives"
