So far K&N is on track to hit 10k before I change my oil again.
In my time of ownership I've been doing oil changes are 7500 miles per the book with a full synthetic mobil 1 and a K&N oil filter since we got it with 155,000 on the clock.
I order the OEM Subaru filters and use Pennzoil Ultra Platinum 5w30. In your case you’d probably want to start using Pennzoil Platinum High Mileage.
I’ve found them to be good
Filter Used : K&N HP-1008 (has a nut built into the filter for a 1" socket; recommended)
I have used K&N oil filters my entire life and never once had one leak from the nut portion of the filter housing
Engine carbon cause the dirty looking oil no filter can get rid of the carbon color and I don't wait 5000 miles I change every month but put on 500 km every week highway also your oils detergents could have cleaned some crap from engine I would do a change sooner myself am switching to Pennzoil ultra platinum 5w 30 and k&n gold for maximum flow rate/ oil pressure and 30 micron rating (70 micron is human hair) year round I've got about 335,000 km on Buick Lucerne 3800 series and aiming for 500,000 I used wix XP for years bought bulk from rockauto and got carbon black every change including my ram1500 only 150,000 km highway
K&N oil filters on the other hand, are like the thread count myth for bedsheets. You are paying a shitton more for 480 Egyptian cotton you'll throw out in 3000 mi.
I have pulled multiple K&n filters out that have looked a little bent like this. The smashed K&n is definitely shorter.
The blue Subaru filters are garbage. Made my FRAM in US. Use the black ones from Japan instead.
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