The rule of thumb I've used for years is "5 quarts with a filter, 4 without". The problem is that the level on the dipstick will vary according to when the oil is checked. A Fram or AC canister filter will gravity drain about half a quart back into the oil pan when the vehicle is parked overnight, due to the location of the pressure control orfice in the standpipe. Checking the oil with the engine warm shortly after it's shut off will show a lower level than a "cold" check before the first startup in the morning.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!