Stage 2+ 2016 wrx here, in my experience (with having run both full synthetic amzoil and motul) I can honestly say that while both are rated very good for the FA-20 I would lean toward the motul simply for responsiveness. The car just seems to respond better to that brand, 100% just off personal experience
My flavor of choice has been Motul 8100 x-cess (5w-40) every 5K or 6 months.
Motul is definitely the best
You can't go wrong with the Amsoil XL. I run OE 5w30, which offers plenty of protection for a stock engine. Unless your tolerances and clearances have changed, there is no reason you need 5w40. Modern synthetics, especially ones designed for the extra heat of a turbo, are outstanding oils.
Motul 8100 X-Clean EFE 5W-30
People swear by Motul 7100 Synthetic Oil 4T.
Motul with oem black filter
In the past I always swore by Amsoil or Mobile 1.
It looks like even with the mileage difference, Amsoil still outperformed in most categories. Pretty impressive.
Now I won’t say it felt faster, but it does seem smoother for some reason. Maybe I’m trying to justify $22.50 per quart.
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