PDS lists the viscosity as 10.0. This sample came in at 10.3. TBN is typical of modern oils at ~6.5ish. Oxidation is at 8. As I mentioned in the last VOA I posted of Castrol Edge, Lake Speed says a bump in oxidation in high mileage oils indicates presence of esters as additional seal conditioners. I don't know what the oxidation value of the non-HM version of this oil is, though. I like the bump in moly over previous versions of M1 and the increase in Mg to offset the decrease in Ca. Looks like one of the finest HM oils out there.