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
The data I've seen round the web, including BITOG forums says that Pennzoil Platinum and Pennzoil Ultra Platinum 5W-30 is as good or better than the waaay overpriced Motul stuff.
Motul xclean, amsoil signature series, valvoline max life, and penzoil ultra platinum are the favorites.
Ive only bought at walmart. $21.97. My turbo calls for an ingredient thats in the pennz synthetic
I also found out the filter (Mobil 1 extended performance) was about $6 cheaper there too
Motul or Penzoil.
My car only gets Pennzoil Ultra Platinum. Seems like a good quality oil!
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.
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.
Pennzoil Ultra Platinum every 3k miles religiously.
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