RLT

Hi I recently changed the oil on my 2001 newly purchased TMAX500. I looked in the manual and filled it with almost 3 litres of oil as recommended in the manual. however, although I am happy there is the correct amount of oil in now, I cannot use the oil check window as it is marked so badly you cannot see anything through it at all. Without renewing the window, any tips as to how I can keep an eye on level? eg dip stick ? Thanks