Old thread, new post. The RP HPS oils appear to have different additive concentrations from the API SL RP oils in the VOAs of the HPS oils in this link:
http://forums.corvetteforum.com/c3-tech-...and-others.html
I'd love to try these oils if the price is right. I'd prefer less ZDDP was used though. They raised calcium and lowered magnesium detergents and raised ZDDP. Of course Synerlec is still used in the HPS oils. I strongly believe it's a sulfurized ester. Sulfur concentration in a VOA of API SL RP by PQI America showed very high sulfur concentration. A BITOG member who is a formulator told me a few years ago that Synerlec is sulfurized ester.
http://forums.corvetteforum.com/c3-tech-...and-others.html
I'd love to try these oils if the price is right. I'd prefer less ZDDP was used though. They raised calcium and lowered magnesium detergents and raised ZDDP. Of course Synerlec is still used in the HPS oils. I strongly believe it's a sulfurized ester. Sulfur concentration in a VOA of API SL RP by PQI America showed very high sulfur concentration. A BITOG member who is a formulator told me a few years ago that Synerlec is sulfurized ester.