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I use six in my 04 GT.I don't go by dipstick indications either.Fill the engine with six quarts and start it up.Ihold the gas pedal down on the floor and crank the engine to fill the filter until the guage reads pressure,then start it up.This makes sure there ain't no unlubed start-up's after the oil change.Let the engine sit for about thirty minutes and look at the dipstick level.You can make a mark with a scribe or center punch to record the actual "full" level.You can also mark the level right after shutdown to show "full" when you don't want to wait for the oil to drainback into the pan.