I own a 2004 Volvo S40 with 56K miles. My car makes a whining noise when I make sharp corners. I believe it is the power steering system. I checked the power steering resevor and it appears low. The manual says to use ATF oil. When i went to the auto store they had many varieties of ATF to choose from. Does anyone know which type of ATF should be used for a 2004 Volvo S40 (older body style)?