The MSDS for 0W-40 German Castrol lists "Pentadecane, 7-methylene-, mixed with 1-tetradecene, dimers and trimers,hydrogenated" as the base oil. Does anyone have a clue what this is (PAO, Ester, baby oil, etc.)? <img src="/forums/graemlins/21.gif" alt="shrug" title="shrug" height="15"...