Electronic dipstick giving spurious readings ?

[XPorker]

Hi all, new CSL owner here.

Had my new toy delivered just over two weeks ago and took it on an extended roadtest the day after.
My test route took in the south of France and a bit of Italy and covered some 3000 miles over ten days

Totally in with the car now and seriously wondering why I've spent the last seven years driving Stuttgarts finest . . . . .

One small issue with the car was the oil level.

After a few hard miles in France I used the electronic dipstick function to check the oil level.

It showed + .9 litres. I duly purchased a litre of Castrols finest and put it in.

The display then showed the level as +.1 litres.

On the final day of my "extended test drive I checked the level electronically again. This time it showed +1.1 litres.

I take it this means the engine requires 1.1 litres and not that I've overfilled it by 1.1 litres ? ! !

I decided that it was better to be safe than sorry and thus put another litre in. After this the display STILL showed +1.1 litres.

Am I being a total f*ckwit or is the electronic dipstick not functioning correctly ? (I believe there are known issues with the system ?)

Thanks in advance.