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[firemediceric]

While looking for some other information, I found this video: POWERSTROKEHELP.COM - The Information Source for Ford Power Stroke Diesel Owners

I have owned my truck for over 10 years. I've done all the oil changes and thought I was pretty good about the basic maintenance, but this video presented brand new information that I was completely ignorant about. I was scratching my head wondering how accurate the claim was that the oil in the high pressure oil pump and the oil feeding the injectors did not get mixed well with the oil in the lower end. I proved the issue to to my own satisfaction just today.

I had changed my oil a week ago in the same manner as I always do; drain the pan, remove the primary filter, remove the by-pass filter, put new filters on and put 15 quarts back in. Since that oil change I have put 250 miles on the truck. I would think that would have given the oil plenty of opportunity to circulate through the entire system. I pulled the dip stick today and the oil is still a see through honey color. At this point I followed the instructions in the video and withdrew the oil from the high pressure oil pump. The oil I extracted was as black as coal. Obviously this black oil had not mixed with the new honey colored oil.

This has confirmed in my mind that the claim in the video is accurate. I didn't use the additives recommended, rather I refilled with straight 15-40 oil. I wish I had been aware of this 150,000 miles ago.