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If I am not mistaken, the interval for severe duty use is still 5,000 miles. Most people fall under that category by definition. There are reasons for the 10,000 mile interval like the reduced sulfur content of the fuel. But there are other issues that you really need concern yourselves with. We are learning that these engines will make oil even under normal conditions. The regen process greatly increases fuel dilution of the engine oil therefore, depending on several factors your engine oil level may rise significantly and this can fluctuate. I saw quite a few trucks with 6.4L engines over the winter with 3-4 "extra" quarts in the crankcase due to the colder weather. Fuel quality, driving habits and vehicle usage that determine how often your truck regenerates the DPF will also contribute to fuel dilution. The more regenerations that take place, the more likely your oil level will rise and idling is now more detrimental than ever. There is no official statement from Ford on how much is "normal" so don't go looking. Since there are quite a few variables, to narrow it down to X-number of quarts is impossible. Checking your oil regularly is highly recommended.
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Ford Master Diesel Technician
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