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Message: <blockquote data-quote="LCP" data-source="post: 203459" data-attributes="member: 2424">I had compared Shell Helix Ultra 15W-50 and Castrol Magnatec 10W-40 before, at room temperature, the Castrol seemed to be thicker than the Shell... hmmm, this surely goes against the "50" and "40" viscosity rating... don't tell me the Shell's imitation... Anyway, anxious, for Vanos engines, all the user manuals state viscosity up to 40 only for some reasons... I'm using Caltex Havoline (Chu Seng only carry this) fully synthetic 15W-50 though... the Castrol Edge Sport 10W-60 is good, but not sure how it will fare in your M50B25TU... anyone here have used a 60 grade before?</blockquote>