I have my Cat filter running after 36K miles. No problems yet.
But the clear prefilter shows junk in it. I imagine smaller particles are caught in the CAT filter.
I used biodiesel, but some of my containers had bits of leaves, stuff like that.
I am also using some old kerosene to cut the biodiesel and to extend the fuel...
So I will use it for a while, then change out the CAT filter.
Will report how it goes.
ON a side note, I used to work as lab manager for major oil lab. I actually climb all sorts of oil company farm tanks, large and small, large oil cargo ships, and one thing I can tell you, is that the bottom of tanks of all cargo tankers, delivery trucks, tank farms, large mixing tanks, etc, is a layer of mud, sludge, water and leaves and other unknown contaminants.
Good thing most oil companies pre filter the fuel a bit, but again, the filters themselves are sometimes dirty, and minor contaminants do get into gas stations/ diesel stations.
Remember, the bottom of those tanks have sludge and water, so find out when your fave diesel station gets fresh diesel, and fill up about 2 days after delivery. You dont want to fill up immediately after delivery, since the new fuel sloshes inside the fuel tank, and stirs up all the settled dirt and sludge and water , into the new fuel....creating a mixture of poorer quality fuel. Wait a few days for the contaminants and water to settle .
You dont want to use the bottom of the tank , where fuel can be mixed up a bit due to churning and could have some sludge get absorbed into the layer