Just a note from a former industry member. Studies, statistics and surveys show beyond any doubt, that almost all oil changes occur at shops, not at home. Mess, time, environmental discard rules, driveway stains and homeowner association rules have stopped this practice at home.
So, shops, dealerships and service stations have dispensers with a dial and the proper amount of oil is supposed to come out of 55 gal drums. I had a case 6 months ago where the amount dispensed at the Cadillac dealership was 3-1/2 quarts of Mobil 1 LOW. Who knows, drum empty, tech was blind, or hose was pinched. But, the auto manufacturer only wants slippery oil for fuel economy during an EPA test. If there is no leakage or burning, the synthetics can run 20,000 miles or more. My CTS counts engine revolutions and pops the oil life fraction based on engine age, revs and service condition maps (heat, airflow, temperature and transmission gear populations.
Welcome to the new world, Captain Ramius. Dump the extra oil in your lawn mower fuel tank or on some driveway weeds.