Originally Posted By: HKPolice
Castrol is thicker than most other brands.
Castrol Edge 0W-20 is lighter than Valvoline SynPower 0W-20 in every viscosity measurement:
Vis@40: 45.08 / 47.00
Vis@100: 8.65 / 8.80
Visc Idx: 174 / 169
Valvoline's PDS doesn't list HT/HS, but it can't be any lower than Castrol's, which is 2.6, the lowest allowable for a 20 grade.