As long as the oil level in the pan keeps the pickup screen submerged so it doesn't suck air and cause the pressure to fluctuate, half a quart plus or minus won't make much difference. With the usual canister type filter installed, there's about 3/4 quart trapped in the filter housing after the engine stops and the canister drains to approximately the level of the inlet line in the side. 5 quarts in a filter-equipped engine will put the dipstick level on a stopped engine at or slightly above the "full" mark. Most of that extra quart will stay in the filter canister and won't affect the dipstick level much, if at all.
Jerry
