Due to the many opinions and questions here my personal experience and instructions. Should the automatic oil be changed,yes or no? Yes! Why not at the SLK? In the gearbox as much metal is processed as in others also and metal causes abrasion over time! I changed the automatic oil during the 160 thousander inspection. Result much better,just now in the cold season. The transmission switches much softer especially when switching down! ufwand minimally about 1 hour if you take time. To do this, screw out the oil draining screw on the transmission tray and release the oil, then remove the six TORX screws from the tub (attention now run again about 2l of oil ), then turn the crankshaft until the draining screw on the converter visible we, these also screw out about 3.5l of oil. Now the filter in the gearbox ern., is only plugged, the oil tank wipe out with a lint-free cloth and the rubber seal reassembly everything in reverse order, of course pay attention to the utmost cleanliness and all drain screws are equipped with new copper discs. Then remove the seal on the filling tube and replenish the drained amount of oil, with my 230K it was exactly 7l automatic oil and that’s exactly the amount that DB prescribes. I think the other gearboxes don’t have any more inside either. Start the engine and switch through all gears for a short time so that the oil can be distributed, ready! Those who want to be safe can now drive to DB and leave the oil level in contact. Costs: Filter and seal in accessories 11,50€ Oil Fuchs Titan AFT 4134 approx. 9€/litre on the Internet incl. shipping Costs total less than 100€ at DB 400€ and the drive is only flushed, so the filter remains inside, makes no sense because the clean oil has to be through the dirty filter (you make use of In addition to this oil the type Mobil ATF 134 and Shell ATF 134 of DB is released and of course the house mark! With me not a little oil sludge had dropped in the tub and the oil had the viscosity of a blood orange, so it was high time to do something. Hope the report is helpful…….