All I know is, Rotella doesn't have those zinc or phosphorous levels. That additive must have it in there. It claims to help prevent metal on metal wear, which is what zinc and phosphorous do. I'm not saying that's all it has in it, but I'd bet money it does. It's not like these oil additives put the ingredients in the back of the bottle.
Well, Lucas Oil stabilizer does... Because there's nothing in there but a thick, low quality oil.
And the previous fill has the viscosity of a 50 weight.