HI...I am a little bit puzzled as to why my oil is black after only 3000kms into my second oil change after the arx clean. Keep in mind I have a 5.4l V8 f150 that has never seen black oil on the dipstick, not that I'm worried at all but after years of oil changes i have only observed dark amber colors after 5000kms or more on my engine. I have heard of people stating about dramatic cleaning during the first rinse cycle, but my experience it seems to be happening on the second one. Can I ask if this is normal for the slow cleaning that is stated on the bottle? BTW I was using Castrol GTX 5w20 before, during, and after the treatment, does the GTX have a different affect compared to other dinos?
