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If you have a 1 qt canister by-pass oil filter, and you change the filter-element and remove all the old oil from the canister, you would an extra quart of oil when you change oil.

5 qts for the engine
1 qt for the 1 qt filter unit

Some people put some oil in the filter canister when they change oil/filter. This results in less delay in the oil feed/pressure when starting the engine after the oil change.