Yeah another oil question - trying to determine the difference between castrol Edge professional E 0w-20w and Castrol EDGE Professional LL IV FE of the same viscosity. I cannot seem to find the formulation differences. Any pointers to pages which might contain this information greatly appreciated

regards
dennis

Afaik one is the JLR branded Castrol oil, the other is the VWAG branded Castrol oil. I don't know the formulation differences but they are probably minor, and have different dye colors in them.

Do you know the dye color of each?

Not for sure, but I think one s green, the other blue.