Quote:
Originally Posted by MysteryTheatre
the highest Viscosity index i could find on any oil was amsoil and royal purple @160 ! but for a third of the Co$t Valvoline Maxlife boasts a shear index of 158!!! the next highest is Valvoline conventional @ 151. Phillips 66 as well as Super 76(both texaco) have an index of 150. every other big name oil i looked up as well as some smaller brands have indexes that are anywhere from the low 140's to scary low 130's to even scarier blank (not published) viscosity indexes . The numbers above are for 10w40. lower viscosities usually have higher indexes for the same oil. therefore higher viscosities , above 10w40 , viscosity index' could be above or around 140 and be acceptable. i found most commercial rated 15 w 40's to be in the 140ish ballpark , which should hold up good. i was unable to find rotella's viscosity index , but i know delo 400 , delvac 1300 super and tection xtra were all right around 140. now with that said , what exactly is this number(how is it determined) ? i guess they shear try to shear the molecules by pumping it through a diesel injector nozzle? all i know is the higher the number the better...
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Thats good info to know. I just put RP in the Disco.
Where did you find the info on this? Want to look into what the shear is for Castrol Syntec 10w 40.
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