I have been using Motul’s 5w40 8100 X-Cess gen2 since I got my car. 2017 Subaru sti EJ257. Built 418 whp No issues every couple oil changes I like to try some Motul 5w50 in there for 2500km or so then switch back to 5w40
I use Motul Sport 5w40 now called (8100 Power) with ester. I've been using it since day 1 of ownership back in 2019. Best oil, no complaints.
Motul 5w-40 300V. 120k kilometers, Stage2 REVO, it doesn't burn.
I get my oil from Sams for about $60 for 4 gallons. I use the Mobile Delvac and haven’t had any issues.
From my past 2 year experience, I’d suggest you to go for 5w30 but with an imported brand from a reliable source. Amsoil, Liquimoly, Motul are some household names.
Mobil 1 high mileage 5w30
But personally i like Mobil 1 brand
I went with Mobil 1 5w-30 ESP. I read around the Bob is the Oil guy and that is what I came up with what I would best for WRX that will be tuned with an intake (My opinion). I am sure there are other good options.
Get the regular Motul if you feel you need to use the recommended brand, but the Twin is definitely not needed.
I used to use M1 0-40 in my VR6 Corrado, but the valve, chains and engine noise went way up, especially at a cold start
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