I run Mobil1 10W-30 with a Purolator PL10111 filter, for 2 years I've changed the oil when the monitor reached 0, about 6500 miles, comes out with a brown color.

Considering my finger was dirtier than my valve cover when I took it off, absolutely no sludge, I say my way is working just fine.

Pics here:
http://i37.photobucket.com/albums/e9...703_131521.jpg
http://i37.photobucket.com/albums/e9...703_133659.jpg
http://i37.photobucket.com/albums/e9...703_145934.jpg