How did you change the oil? Was the engine hot? How long did you let the oil drain?
Personally, I change it while the engine is as hot as I can stand and then let it drain overnight.
There will still be some amount of oil left in the oil cooler and the oil cooler lines that you won't get out. After I do this, I add 8 gallons and it typically brings the oil level right up to the FULL mark on the dipstick YMMV.
Oil level reading is best, most accurately, done after the engine has been off and sitting on level ground for a couple hours. This gives the oil time to drain down to the pan. Hope this helps.
1985 300SD - 'Grace' (198K mi.)
2010 Honda Fit Sport
2013 Honda Accord Sport
1996 Lexus LS400 (Retired)
1995 Ford Contour SE (Retired)
1976 Porsche 914 (Sold)
1972 Datsun 240Z (RIP)