Over the Counter Zinc Additive

I'll give you kudos for calling Valvoline. The current Valvoline spec sheet tell the story..... 1400 PPM zinc..... anyone can look it up online. I'd recommend making decisions based on the manufacturer's data. I bet if you asked the shops down there, no one could tell you where their info came from. I've heard/read the VR1 rumors before.... even that they lowered the ZDDP and then raised it back up!

I looked for specs on the Schneider #2 additive and cannot find any info on the ZDDP concentrations, so personally consider it an unknown at this point. That does not mean is won't work fine, just that, if you cannot find the specs, then you can't really know where your ZDDP concentrations are ending up at. Keep in mind that if you OD the engine on ZDDP, that can cause its own problems; I've read mention of spalling on the cam surfaces as one... in technical and research papers on the subject.