Hello dear Motor-talk Friends I saw Frontal21 in ZDF last time, it was about the installation of a so-called secondary current filter in the oil cycle of petrol engines, with which it is possible to drive a very long distance without changing oil. It is only admitted at regular intervals additives to maintain the lubricating capacity of the oil and other properties. Among other things, it was reported that with a VW 1.9TDI motor a test run of 150000km without problems completed It is certainly understandable that the automotive industry is not interested in a standard installation of such filters, especially since of course every quantity of customers would no longer come to the workshop for an oil change. Not to mention the ecological aspect. mfg Christian