I did my filters, all of them looked just like the new ones, except the strainer was pretty plugged up. I figured a 10K+ motor, 5 years old, may as well be safe than lean it out and burn it up.
Well, I took apart the strainer, cause I have NEVER seen a canister filter that costs $90, except maybe on a Porsche 911.
its almost black inside, so it was due.