As a Mercedes-Benz guy, I've used Mobil One European Formula 0w40 in them for decades. It is very good oil. I have well over a million miles on Mercedes-Benz cars using that oil with the extended (10K-15K mile) change interval with zero issues. Several of my cars have gone over 200,000 miles.
But if you want the short of it:
ANY high mileage full synthetic 5w-30 oil will do great. Mobil 1? Sure. Amazon Basics? Hell yeah. Wal-Mart's Supertech? Send it.
Ran fine when I got it but I switched to amsoil and it has changed the sound of cold starts. MUCH QUIETER!! and seems to have smoothed out the idle over time.
I dropped some 0W-30 Mobil 1 this winter, and my sol with a d15b7 loved it. Made cold starts very smooth, and noticed no reasons not to continue running it.
I've used only 5w30 full synthetic (usually Mobil 1, sometimes others) since I bought mine 15 years ago (D15B7). Using the high-mileage variety nowadays, supposed to help out the old seals etc. Just over 150k miles but engine runs very smooth so seems to be doing the trick.
I use Mobil 1 synthetic blend HIGH MILAGE 5w-30. I think the high milage formula is the best for these old engines.
I run Amsoil 5w40 warmer temps and Ravenol 5w30 colder temps.
My G37x likes mobil 0w 30 car feels great with this oil
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
Been using Mobil1 5W-30 since 1998... GTI now has 232,500 miles and is smooth as silk. I do oil changes on the dot at 5K miles.
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