A difference I recently noticed is with the Purebase Multi Vicosity Oils they show the Low temp Viscosity ASTM D-5293 at 3300 @ -25 C when it actually 7000 @ -30C for the 5/30 and 7000 @ - 25C for the 10/30
Also the two oils above show a Volatility % Evaporation @700F ASTM D-2887 @ 17 when in fact it is 15 .
These oils have approximately 1100 PPM of Zinc and .084 Sulphated Ash which is not listed on the website.