Exactly. Funny thing is there is also no change in oil filter still.
Been using several renowned oil supplier(all using fully syn. oil) namely castrol, shell, motul, LM in the past and now mobil 1 but all shown otherwise, color goes dark at around 4-5k km of oil mileage. OCI done around 6-7k km mileage due to the mentioned tell tale signs from butt feel. Perhaps one can just ignore and push on on the pretense that the oil is still good? Furthermore even at Bitog, the oil filter is recommended to be replaced at 3-5k miles(5-8k km) of oil mileage if one intent to pursue an extended OCI. Also it wouldn't be accurate to compare apple to apple on the mileage of what EO is capable off since the climate parameters and exposure to the air contaminants are very much different.