Mine shows a range to fill, not an exact amount, so don’t have to be too accurate. I then turn the ignition on without starting until the top up has been registered.I get that but if it says it needs 8.5 litres then I need to know that I have put 8x 1 litre and then half a 1 litre.
If I try and guess 8.5 from a 10 litre bottle then I might put in 9 by mistake which would overfill it and mess up the sensor no?