I AGREE! Reading the oil level in my 2015 WK2 EcoDiesel is the more difficult than any other vehicle I have owned over the last 45 years.I have the 3.0 litre diesel. Oil consumption isn't the problem, it's the dipstick reading that's the problem.
The only time I can get a consistent reading is at room temperature after the Jeep has sat on a level surface overnight. After that first dipstick reading, it is impossible for me to get a clean dipstick reading. I have read people suggesting to VERY SLOWLY insert and remove the dipstick to get a reading. I have had zero luck when trying that.
Like you, my dipstick reads low when I measure after sitting overnight. It measures right at the "MIN" level (see below). I have no oil consumption issues and the reading remains consistent between oil changes. I am certain it has the specified 8-quarts (7.7 liters) since I change the oil myself.
My dipstick has "100F" stamped on the same side at the MIN and MAX levels. I have assumed that is the temperature for those levels. 100F is about the temp of my garage here in Texas. Like you, I have considered adding an additional quart/liter of oil.
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