Hello. Recently, the topic of oil exchange interval and oil consumption (2.2 tid) has been a topic in this forum. I have collected some links on this topic: oil consumption from where, why (Aral):http://www.lubric-basics.de/…/motor oil exchange interval (Aral):http://www.lubric-basics.de/…/00.html The last link says it politely, but at least. Oil exchange intervals of 30,000 – 50,000 km represent the theoretical limit under optimal conditions. mmung (Aral):http://www.lubricant-basics.de/…/olprobleme.html In this article, all the arguments that the41kater and others have already brought forward in this forum. Oil thickening – diesel and petrol (Aral):http://www.lubricant-basics.de/…/olprobleme.html Oil ageing (Total Lubricant Lexicon):http://www2.total.de/en.de/part3/chap1/index.htm Age protection Hydrocarbon molecules can connect with oxygen and form larger molecules. This process is called oil aging or oil oxidation. This process is accelerated by higher temperatures and stimulated catalytically by fine metal abrasion. This process can be slowed down by ageing protection substances or oxidation inhibitors. Ultimately, however, only a timely oil change helps. Years ago, resourceful fans came to the market, who have praised microfilters, with which changing intervals of up to 100.00 0 km should be reached. Certainly, such a filter does the engine well, as less rapid oil breathing due to less metal abrasion in the oil. The oil oxidation by oxygen can also not prevent these systems. Such systems can be flanking. Ultimately, only regular alternating intervals help. Greetings of 93tid