I want to open an extra thread here again, because the topic for some is not completely uninteresting and always new information comes to my ears. Here my current state of knowledge, after a longer conversation with a ZF operation, who knows all 3 possibilities of an oil change and also its pros and cons: Should I have confused something sorry I am not an engineer and the conversation was long and accurate. So, the 3 possibilities of a gear change are: a.) Be i VW leaves the oil, renews the sieve with seal and cleans the magnets including oil tray bottom and fills 9 liters of oil. b.) In a ZF operation the oil is also drained, but a special “suck/pump” is taken out of the converter 4-5 liters old oil !!! On request even an extra oil flush (with new oil) is carried out ! Sieb&seat are renewed, magnets & oil tray bottom are cleaned – as with VW and new oil filled. c.) Mr. Eckart ( http://www.automatikoelwechselsystem.de/impressum.html ) removes the oil, filters it and adds 600ml special cleaner to the Altoel and rinses the gearbox again. So he gets the “slag” out of the converter and cleans the whole system. This procedure is currently being tested by ZF and released in 4-5 months at the earliest. Otherwise everything is cleaned and renewed and refilled here as well. I don’t want to comment here because my knowledge base e is too small to praise or criticise any system. I’m only interested in passing on the information I’ve received! Unfortunately, the fact is that sometimes (1% risk) after a cleaning/draining or even the normal oil change still loose, jammed chips settle down and thus can lead to new problems already after 2 – 3000 km. I came to the topic because I sometimes feel a slight jerking when driving. I was told by ZF now advised (have 82,000 Km on the clock) to let us first see after the gear oil: “On the oil one can see how big the abrasion was and what has to be done”……so the exact statement. A fair suggestion, as I mean, before you let all exchanges/spins/cleaning…