oil container capacity merc 90 2 stroke injected

[seashawgal]

Can anyone tell me how much oil the above motor holds in the two stroke oil receptacle. It's the type that fills from the top of the motor via removal of the oil cap. A dealer says he thinks it's about 2 litres of oil. I just keep adding half a litre here and there as I've never actually known exactly how much it holds? There is a dip stick which has a small piece of downward facing metal half way down the dip stick but I'm even unsure of what that means.
Also can anyone say approx how much 2 stoke oil the motor would use from an 80 litre tank of fuel?
Sorry to be naive but I've googled and it's not easy forth coming information.
Ros

[Fed]

This should cover it.

[Fed]

The little piece of metal is a hook to sit the dip stick on the lip of the tank rather than sticking it in your pocket when you're filling it.

[seashawgal]

Thanks Fed
The hook is for hanging off the lip of the tank such a simple thing and I didn't realise it