Valvoline is most likely using MoDTC dimer. MoDTC trimer is more sulfur rich relative to moly concentration in raw form, which is part of why it's more effective at creating MoS2 at lower concentrations, but this also means it pushes the API SP limit for sulfur. (0.5% max) If they had MoDTC trimer at that concentration, given the other sulfur-containing additives in the formula, I wouldn't see them being able to stay under the API SP limit for sulfur.