Thanks for the link. Don't the 40 series and 50 series have different oil viscosity specs? Further muddies the waters so to speak. The most disappointing thing in all this is the apparent lack of understanding of the oil spec page in the handbook by all of the Toyota personnel I have asked. My opinion is that a good quality 5W-30 will be OK but I will probably go with Penrite PRO10 a semi sun 10w30. Very attractively priced.