i too wonder as i recently purchased + am using their 5-40 trying to cut consumption in girlfriends 13 malibu 2.5 LS, time will tell!! it was drinking the spec 5-20 then a 10-30 penns as well as mobil I, better for a while but at almost 60 thou its getting worse!! just remembered reading the real synthetic ONLY pertains to oils CONSUMED in Germany + NOT those for export!!