Nearing 5000 miles and my oil is starting to have dark carbon particles showing up on my white paper towel as I check the oil. Oil is also now medium brown. So I decided to change the filter, and add a quart of make up oil. I know Bob is doing those remote filter tests, and I'm doing my own with my engine oil pressure gage. I noticed that the start up pressure is now a little lower with the new filter. I have to say my filter was finally getting restricted with crude. Guess I will keep eyeballing the oil everytime I check the oil to see when another filter change will be in order. It will interesting to note any cleaning of my oil with the new filter before it starts getting darker again.
Leo
Leo