I used to think that the higher the VI the better but someone told me otherwise, can any bros here pls enlighten me, thanks. The msg below are the answer by a fellow forumer. If you compare 10w30s, the one with the lower VI is the better choice. Less VI improvers mean the oil has a less chance to shear with VII breakdown. Look at specs for M1 10w30, Redline 10w30, RP 10w30 and compare with Chemlube. Furthermore, why is there no website for chemlube where specs are available. No one in bobistheoilguy forums even talks about chemlube. Cant be a very popular oil in the states.