I use Motul 300v Chrono (10w40) in the Stagea.
I used the that Nulon 10w40 that you are asking about in my wife's Magna kast service. Seems to be good shit.
the Magna was burning a heap of oil and was very noisy (probably due to the 3L of oil that was left in it after 10,000kms). Put the Nulon in with their tappet treatment, damn quiet now and is great on startup. My wife says that the car is much, much smoother now.
Have had in the Stagea (all 100% Synthetic);
Royal Purple - good.
SHell Helix Ultra - ok.
Mobil 1 5w40 - too thin, engine didn't "feel" together, was quite noisy and I didn't have the confidence to push it.
Castrol Edge - not so good. Engine "felt" loose and was a bit noisier than I would have liked.
Motul 8100 - rubbish, could smell it burning, when I changed it (800kms after putting it in) a large mass of crap that smelt like charcoal came out.
Amsoil 10w40 - good.
Penrite Syn 0w50- way too thick. Felt like the intake pipe was 90% blocked off. Just didn't want to rev. (changed after 1100kms)
Motul 300v Chrono 10w40 - Best to far... by a long way too! Engine revs effortlessly, is damn smooth and is quieter than the any on this list. (too bad it costs so much)
I used to change every 5000kms, but I have extended that to every 10,000kms with the 300v.
Will be trying the Nulon 10w40 with my next service (2000kms away).
I say give it a shot. If it doesn't feel good (you will know), just change it. 5L of Nulon is what, $50?