Hi, further to my other comments regarding the type of atf used for the LS430 gearbox.
There are an awful lot of myths and misconceptions published over what atf to use in a particular gearbox.
First, vehicle manufacturer do NOT produce their own transmission fluid, they order it to a particular specification from the same place as everybody else, an oil or fluid processing plant and then rebadge it, in the case of Toyota, to JWS 3309, who rebadge it Toyota Type T-1V.
Second the atf specification is not laid down by the vehicle manufacturer, who uses a particular model of gearbox in their cars, it is actually laid down by the gearbox manufacturer for pretty obvious reasons, which In the case of the LS430 which uses the Aisin Warner A650E model gearbox happens to be JWS 3309 and NOT Toyota Type T-1V That is the title Toyota decided to give the fluid they use and sell...
Now, any fluid which meets that specification would be absolutely ok to use, that is the reason why the suppliers that stated their fluid was ok on Andy of Cheltenham comment were correct.
The fact is an awful lot of Lexus and Toyota dealers use Dextron III, the reason? Dextron III is produced to JWS 3309.
Mobil actually put the Spec number on the fluid Mobil 3309 it is also on Motul fluid and Mannol fluid.
I would suggest that anybody that is not clear about what fluid to use should contact Aisin Warner for clarification
The conclusion to this is that any fluid that meets the JWS 3309 spec. is ok to use in the A650E gearbox therefore it is ok to use it in the LS430.
So the owners of the Lexus LS430 might want to have a rethink on buying very expensive atf..