go look at the recommended specs and approvals along with considering the startup viscosities and also the CCS and MRV , and CST like the published 40c & 100c operating temps, at estimated viscosity's, ,much of a engine's wear can be at starting oil flow (faster is better) at not only cold (winter) temps but , the running (warm) viscosity does also have a bearing on the fluidity of the lubricant , in regards to this, Euro oils maybe higher in this event in relation to only the European engine specifications ( ACEA gas and diesel) ,,, higher may not be better for example in Asian and USA( GASOLINE ENGINES),,, , thus a lower operating viscosity may and have a overall positive effect, on VVT and other functioning engine components. Plus the MPG configurations and other requirements. in other words higher EURO, ACEA and others viscosities may not be in the best interest to all GASOLINE engines.