This thread is still going?!! Anyone tried Mobil1 0W-40, Motul X-cess 5W-40 or Motul X-clean 5W-40 in their IS#50 yet?
Motul have a new oil coming out in the Australasian market soon called Sport Ester 5W-40. http://www.opieoils.co.uk/pdfs/motul/MotulSport5W-40GB.pdf
Ester is an amazing product, rather than me ramble on about it you can just read this link >> http://www.bobistheoilguy.com/esters-in-synthetic-lubricants/
I run Motul 300V in my 3SGE which is a full Ester oil, the car has never run so good. Only down side is it's a race oil so needs to be changed every 6K km. The PAO & Ester Motul Sport should be able to handle a few more km than 300V, say 10-15K. This will be a great oil for the Australian climate to use in the IS#50. I highly suggest you try some once it becomes available. https://www.motul.com/au/en/resellers
Wind Chaser if your car is using Edge 5W30 then a cheap 10W40 isn't going to fare any better, see above my recommendations above or if you're really on a budget then Shell Helix 5W40 is then next best & very reasonably priced. Anything else is a waste of time IMO