I have only run the Pennzoil Platinum in my car, but will likely be switching to the Ultra Platinum on one of my next couple oil changes (once lilsean gets them analyzed). I've never run Valvoline in any car I've ever had, but it's hard to argue his Used Oil Analysis report.
I think you're overthinking it. As long as you get a SN+ (or greater) oil that is 5w30 and synthetic, you shouldn't have any issues. Just change it regularly (3k-6k depending on driving conditions/habits) and use a Subaru OEM Black filter, and you're golden.
Personally I use the OEM Black filters (3 pack) and Pennzoil Platinum, but probably switching to Pennzoil Ultra Platinum on the next oil change. I'd def stick with the OEM filter, but oil isn't as important as long as it meets the SN+ oil certification (synthetic 5W30).
i get them directly from dealership parts department because ive known the service manager for over 20 years and he practically lets me steal them, but the ones on amazon are absolutely fine, buy from this listing there are no sketchy reviews. just idiots mad that they bought the wrong filter.
It's not guaranteed, but if you order online like these, they do come with the crush washer for the drain plug.
Join the Amazon 3 pack gang lol
Here is how I buy my filters for the WRX. Also, don't use the washer that comes with the Fumoto... just use a crush washer.
Subaru Engine Oil Filter & Crush Gasket (3 Pack) 2015-2018 WRX 2.0 15208AA170 OEM https://www.amazon.com/dp/B0719QQ42M/ref=cm_sw_r_cp_api_glt_fabc_7TVKPQJXDXA63F4DZWFA?_encoding=UTF8&psc=1
I got these from amazon. Even though they aren’t prime, mine came in in about three days. I believe they’re the same ones on eBay.
Subaru Engine Oil Filter & Crush Gasket (3 Pack) 2015-2018 WRX 2.0 15208AA170 OEM https://www.amazon.com/dp/B0719QQ42M/ref=cm_sw_r_cp_api_i_ytfzBbBD78594
Penzoil Ultra (this ones prime)
Pennzoil 550045201 Ultra Platinum 5 quart 5W-30 Full Synthetic Motor Oil (SN/GF-5 Jug) https://www.amazon.com/dp/B01M266FWZ/ref=cm_sw_r_cp_api_i_OufzBbF822234
Fumoto drain valve (prime, came in same box as oil)
Fumoto F-108N Engine Oil Drain Valve https://www.amazon.com/dp/B003VCB9WC/ref=cm_sw_r_cp_api_i_gwfzBbA06E414
Gonna change mine this weekend. Have a little smidge over 2k miles.