Huraaay! It's fixed! Thank you to all of you who helped me figure this out. Thanks especially to Henrick after you told me I have to go back to some original settings.
Setting the oil quality to "good" enabled you long-life intervals service schedule.
So you actually enabled Long-Life service on a car which is not compatible with that.
Take your VCDS and reset all the settings to time-distance schedule (US-spec).
As it turned out my problem was not exactly as stated in the italics, but I knew enough to watch for something in that context. I was rooting around in some txt logs in my RossTech\VCDS\Debug folder and found an Excel spreadsheet that I hadn't found earlier, and didn't know existed, and it told me everything I did exactly in order of sequence with dates and all. When I got to the line that said,
"Address 17 5C6 920 851 A channel IDE00492-MAS02013-ESI: Coding of Service Interval Extension (SIE)-TOG adapted from Oil level thermal sensor not connected to instrument cluster to Oil level thermal sensor connected to instrument cluster Saturday September 30...", I knew that I have to change that setting back to "not connected" because there isn't one in the oil pan. It told me I have to go to 17 Instruments, and the channel description and from there it was easy. It is now changed back to
"Address 17 5C6 920 851 A channel IDE00492-MAS02013-ESI: Coding of Service Interval Extension (SIE)-TOG adapted from Oil level thermal sensor connected to instrument cluster to Oil level thermal sensor not connected to instrument cluster Sunday 10 December 2017 18:28:13:45443" with today's date and time stamp.
So thanks again for your time and input, all of you.