I quote this from the free download-able owners manual..."Remove the oil cap by turning it counter clockwise. The oil level should be 1.5" below the rear lip of the oil cap bung. Use caution to not overfill the oil tank." Your oil tank on a 03 Pit Bull is (again from the service manual) "Oil Tank Capacity after Draining Not including engine or oil filter is 2 1/2 Quarts." Also; "When checking the oil level, the motorcycle must be straight up and level." In other words, I just use a tad less than 3 quarts, in my 03 Pit Bull. Hope this helps.