My Lexus Owners Manual(for my 2001 RX-300) calls for Toyata T-IV 4 qts but, when doing a drain/refill I have replaced anywhere between 4.0 qts and 4.3 qts depending on the angle of lift while draining and just how long I allow all of the fluid to drain. The Haynes Repair Manual for these models...(Toyota Highlander/Lexus RX300/330 - 1999-2006)that I have in front of me while Im writing this call for 4.1 qts(3.9 l) for the RX-330 AWD. The Haynes Repair Manual does not show the total amount of ATF that I can find at this time, only drain/refill. I will keep searching if you like. These repair manuals are not gospil but they claim that they get their information for the MFG.