Somewhat interesting, when read in conjunction with JAG's find a while ago that OCP are much more shear stable than some of the others http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1171968
Influence of Some Additives on the Efficiency of Viscosity Index Improver for Base Lubricating Oils Prof. Dr. Talib Bahjat Kashmoula Tiba Naif Jasim E-mail: [email protected] Chemical Engineering Department, Collage of Engineering, Alnahrain University, Baghdad, Iraq ABSTRACT The effects of three different additives formulations namely Lubrizol 21001, HiTEC 8722B and HiTEC 340 on the efficiency of VII namely OCP of three base lubricating oils namely 40 stock and 60 stock and 150 stock at four temperatures 40, 60, 80 and 100oC were investigated. The efficiency of OCP is decreased when blended with 4 and 8 wt% of Lubrizol 21001 for all the three base oil types. But it is increased when adding 4 wt% and 8 wt% of H-8722B in 40 stock. While for 60 stock and 150 stock the OCP efficiency decreased by adding 4 and 8 wt% of H-8722B. In the other hand, it is decreased with a high percentage by adding 4 and 8 wt% of H-340 for 60 stock and 150 stock and for 40 stock it is increased by adding 4 wt% of H-340 and decreased with insignificant percentage when adding 8 wt%. Finally, a number of VI correlations have been obtained depending on the results predicted in this study. These correlations represent the functional relationships between the VI and the concentration of OCP for three types of base lubricating oil and for each type of additives.