Done 500+km with AutoRX, used fresh Chevron Supreme 10W30 and oil filter for better results.
I can see dislodged/dissolved sludge particles on the crankshaft and there are lots of tiny black particles being suspended in the oil as well.
Engine is a 2.5yrs old 2.3L Nissan V6 which has done mostly city driving, odometer is currently reading 41,109km.