have u tried fuchs?

they are pretty good

im going to whack in 10w-30 for my 2zz-ge yes i know its not a rex engine but they make a 5w-40 variant called titan supersyn and its fully synthetic

european oils are better quality apparently, the cost of it is slightly cheaper than the mobil 1 5w-50

but if you want best of the best i think motul 300v chrono 10w-40 is the way to go or redline but its bloody expensive