Build Up in Oil Filter?

[MOAK]

Your filter did it’s job, the impact loosened up the sludge that builds up in filters, it’s part of the reason you change them.....

A side note on oil, I was part of a fleet study that used Pennzoil, valvoline, mobile, amsoil, and another brand that I can’t remember. The penzzoil had the lowest life in our machines and valvoline was second worst. Mobile 1 was the best of the big brands so we went with that.

Perhaps switch over to mobile 1 and see if your results change.

Ive been using Mobil I since it's intitial inception back in the very early 80s. Once in a while I used Castrol synthetics only to switch back to Mobil. Currently my engine leaks about a quart every 700 miles so until the leaks are buttoned up I've been using Delo 400 with great success. To the OP, Why are you changing your oil every 3,000 miles? It really isn't necessary. Drains at 6 to 8k is plenty. I had my mobil one used oil checked at 10k nearly a decade ago and all was good.