I just did my 4000 mile service, changing oil and checking fluids on my 2020 DCT Tour. I also checked the oil in my final drive gearbox which isn't part of the service. Low and behold, very little oil came out (maybe 2 oz). The Gearbox holds approx. 6 oz. The very same thing was also with my 2018 DCT Tour. So you may want to check it.