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That article was written before the Ford spec existed as evidenced by the T6 in the article being listed as CJ and not CK. The Ford spec came about after CK spec oils became the standard.
Also, that article was written by a bottle reader and contains no substantive content. In other words, the author read the manufactures’ marketing materials, then wrote an article. I found this particular quote “Shell Rotella synthetic diesel oil can last up to 500,000 miles or 10 years if used properly.” interesting when the author was talking about the oil change intervals each oil offered.
The 6.7L Powerstroke was not doing well with the present and common low phosphorus engine oils. Phosphorus below 800 ppm (parts per million) was determined to be the cause. Later, a specific engine test was created to validate the performance of approved engine oils, since the phosphorus level alone can be a poor indication of the specific antiwear chemistry effectiveness.
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