'11 EC300 Oil Quantity

[andoman]

I've done a fair amount of searching and I think I found the answer. I'm sorry if I sound like a total noob...

I completely drained the oil. Left the plug off all night.
Could only pour 650ml back in before the level was half way up the sight glass. Couldn't run her cuz the head is off. But I did cycle the kick start several times and the level didn't change.
I don't think that I had 250ml of trapped oil. Rather, I think that the oil sight glass doesn't really reflect the 900ml quantity called for.

The answer: I think I should pour the last 250ml in and ride on.
Anyone want to chime in and tell me I have cracked the GG oil quantity code?

Thanks!