It is interesting.
I make around 2000 km per month, 24000 a year. My oil hasnt been changed since April 2010 or 20 months, 37000 km. The oil in my car is Castrol Edge Turbodiesel 5W-40 and it is adequate for my car (505.01 regular changing intervals max. 15000km or 12 months). My car VW Passat 1.9 TDI, PD, automatic transmission, 96 kw or 131 HP. I checked the oil yesterday (fingerfeeling and visual inspection) apart from being black it is as viscous as new oil.
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