Oil Additives... Yes or No???

[Enzofour_imp]

I always have the problem of putting the right amount of oil in the engine.
lately I have put Lit. 3, 85 of Motul 7100 10w30 and the level, even after 1 hour, is all full, to see the level go down to the upper limit I have to wait 1/2 day when the engine is completely cold.
To get the right level when the engine is warm, how much oil do you EXACTLY put?
Thank you