What Oil Do You Use for Diesel Engines?

[bigfut]

I feel there would be more to this than just the oil. It doesn't matter how good it is once its dirty, it's dirty. A good diesel oil keeps your engine clean while still being able to maintain its lubrication properties. To keep it in spec there would surely be extra filtration used like the franz one mentioned earlier (toilet roll style).

I remember reading an article on this. He installed an extra aftermarket in line oil filter that cost an arm and a leg to achieve these intervals.