All dealers will tell you that the best way to check oil levels is with the bike flat on the ground and someone holding it level.
If you use this method, vesus having it on the centre stand, the level will read slightly higher.
If my memory serves me correct, Susuki claims the capacity is 3.3 litres (3300 cc) and if you do not change the filter, add 3.3 litres to the bike, and then check the oil level when it is flat on the ground, you are bang on.