Was also wondering bakit ganoon kadami, since I always check on my dipstick regularly (engine cold) and it seems halos wala pagbabago level ng oil. I overheard the other day at diamond fairview one of the SAs telling the other customer (montero) that 2 liters is needed for the top-up. so I guess SOP nga nila ito. But could somebody enlighten us how the 1.5 gets consumed? By the way, I remember that only once did they give me back the excess oil from the top-up. I did not demand it na because I don't have a need for it at those times baka mai-dispose ko pa improperly, mas masahol pa kesa sa tambutso lumabas.