Hello, my longtime companion Audi A6 C4 (petrols) I give so far a universal light running oil 10W/40. Next year an MB 230E W124 (petrols) is added and shortly for my wife an A-Class A160 W168 (petrols). With my A6 I have kept it so that I had to make the oil change in a free workshop – but have brought my oil with me. On the one hand, in workshops often very expensive oil is filled. In addition, you have no control over what a It’s probably that the same oil is filled into all kinds of vehicles. My SAE 10W/40 (according to the label: VW 500.00 / 505.00, MB 229.1 / 228.3) for the A6 goes out slowly and before I buy new ones would be great, of course, if I could find one that I could use both in the A-class of my wife and also in the 230E. Even I have no idea. I found that 504.00 seems to be the latest VW standard for petrol engines, which also includes older petrol standards. If you follow recommendations from online oil suppliers, you will be shown the most different oils for one and the same vehicle type after vehicle selection. Search results also promote the most different recommendations to day. So I am completely confused. Can someone please bring light into the dark here, if necessary with manufacturer links, which are too obvious I imagine that I then have 3 standards for the 3 vehicles which I can ask for with a regional oil liferant. Additional information: The A6 will probably remain the main vehicle with predominantly short distances at about 10TKM/year, usually parked in garage. The A-Class has to park outdoors even in winter, almost exclusively short distance (2Km to work, 10Km to shop) The 230E parked mainly in the garage, was and is little driven, in future with H-marks for walking trips. Now I’m curious. Thank you very much in advance.