The spec is 48oz. Did you change the oil filter too? Just run it for a few minutes to let the oil fill up the filter and oil passages, etc. Are you on any kind of incline?I checked several sources and they say my Craftsman T2200 riding lawnmower with the Briggs engine should hold 1.7 liters of oil, which is over 50 oz. I checked the dipstick after adding 36 oz. and it was way overfilled. Do some of the engines take less oil?