First of all, change the brand of the oil filter and do the same test again. My recommendation is Hengst filters, same quality with Mann and Bosch, made in the same factory in Slovakia.
Only ever use Subaru OEM oil filter on mine and penzoil platinum full synthetic
I have 234k miles on my 2016 Outback and I usually use Napa or O’Reilly house brand oil and either a Subaru or WIX filter.
I have had good results with the Hengst. Recently ran a Hengst to 20,000 miles. It’s was a bit crispy but was doing just fine.
Also get a good Putolator or Subaru brand oil filter that is rated for the higher Subaru oil pressure so that it is filtering more often and not blowing open the internal filter bypass because Clean oil will make the engine last longer.
It’s easy peasy to DIY at every OCI (5k mi or 6 mos whichever comes first, 2014 Mazda6 Touring 6MT). Been doing it, for decades (various makes; at times with an oil boy vacuum fluid extractor). Will be changing mine tomorrow. This time, will try Kirkland 0W20, with a German Hengst oil filter (identical dimensions/specs Made in Japan OEM Mazda PE01-14-302) plus Lubro Moly MoS2 (molybdenum).
Oil service has been done every 5K since then using Liqui Moly Molygen Full Synthetic 5W-40 and Hengst filters.
My E550 gets M1 0W40 every 5k, with a new fleece Hengst filter. I don't drive it hard until I see past 80C on the water temp (I don't have an oil temp gauge- only the E63s do). Basically the same procedure I use on my S54 BMWs, and every performance car I've ever owned
I swapped in a new Subaru OEM oil filter on my 2016 MT. After a short 1.5 miles drive, thin smoke escaped from beneath the hood, and a pool of oil gathered. Oil was literally burbling up from beneath the oil filter and spilling out. I immediately turned off the engine. I will not be using anymore of the junk OEM oil filters.
The oil on my wife’s crosstrek leaked and had to get it replaced. Guess there’s a known issue with them
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