hello, i just did my first oil change. 05 2500 ctd. i filled the oil filter and added the remaining 3 gallons of oil to the crankcase, ran the engine for a few minutes, let it set about 2 hours, checked the oil level and its about 1/4 to 3/8 inches below the full mark on the dipstick. the manual specifically says pour one quart of oil in the filter and pour the remaining 11 in the crankcase. should i add oil till its up to the full mark or leave it as is? thanks