I am sure this stuff does as advertised. But unfortunately for me i misread the label. Was looking for the zinc additive. Only giving 3 stars because it was the big advertised option at the top of the search list when i searched "zddp additive" . This product contains no zinc so if thats what you are looking for, this isn't it. Risoline makes a zinc additive sod on amazon for the same price though.
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