Which Oil would be best suited?

[SR5]

Then buy on price, either SHU 5W40 ($45 at SCA) or Penrite 10-Tenths 10W-40 ($65 at SCA). The two best deals going right now.

You could buy one of each and see which the car prefers and runs the smoothest on.

 

[Shannow]

Repco's home brand 0W40 is Penrite too...

 

[UltrafanUK]

Just use the engine specific oil finder page of the major brand engine oil company that seems to do the most special offers in Walmart or your local oil shop.
Do not use the US or Japanese web site as it might recommend something thin, just use the .co.uk or .de website.
By major brand I mean, Mobil, Castrol, Shell group and Liqui Moly. M1, Edge, Ultra or Synthoil etc. I would include Valvoline if in need of a good High Mileage oil.
Stick to OEM oil filters unless you are looking at using a long life M1 or Amsoil one to do 2 for 1 oil to filter changes.

 

[BrocLuno]

If you really care about quality oil that has been extensively tested, buy one off the Porsche A-40 list. Me, I'd buy 5W-40 for a turbo. But any A-40 oil will be as good as it gets.

I'd pick one brand and stay with it. I wish we could get Penrite 10-10ths here, but we have plenty of choices. You have a different mix of choices. But in the world of A-40 oils you have enough choices to get a bazzilion miles out of that engine