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Unfortunately this is in German. I could not find anything in english. The story is that with modern oil under normal conditions there is no need to change the oil ever, just the filter. They have examples of engines running several hundred thousands of miles without oil changes and no problems. This is from a national TV station with no product selling agenda.
I am aware of discussions at a previous employer that extended the interval to 30k with a filter change only at 15k. After a while they went back to 15k with no technical explanation.
Personally on every vehicle I have owned in the last 20 years, I have changed the oil and filter once a year regardless of milage. The inside of the engine on my LT looked sparkling clean after 11 years. I used several different brands of oil along the way. Mainly Castrol semi synthetic and Mobil 1.
http://www.gaskrank.tv/tv/werkstatt/oelwechsel-ueberfluessig-und-a-2481.htm
I am aware of discussions at a previous employer that extended the interval to 30k with a filter change only at 15k. After a while they went back to 15k with no technical explanation.
Personally on every vehicle I have owned in the last 20 years, I have changed the oil and filter once a year regardless of milage. The inside of the engine on my LT looked sparkling clean after 11 years. I used several different brands of oil along the way. Mainly Castrol semi synthetic and Mobil 1.
http://www.gaskrank.tv/tv/werkstatt/oelwechsel-ueberfluessig-und-a-2481.htm