Volvo now requires dealers to use the Castrol oil meeting the RBSO-2AE specification and will not reimburse them if they use any other oil in the Drive-E engines. I believe that this policy was put in place to get most Drive-E engines on what Volvo now considers to be the correct oil in the US market. I don't think they are saying that the car's warranty would be void if other brands of oil are used provided they meet the RBSO-2AE spec. Volvo is simply not going to reimburse their dealers for anything other that the Castrol Professional RBS0-2AE product.
You can use any oil that meets the Volvo RBSO-2AE specification. You are not limited as to which brand of oil you use provided it meets that specification.
You can use any oil that meets the Volvo RBSO-2AE specification. You are not limited as to which brand of oil you use provided it meets that specification.