I've used Mobil 1 since the first oil change. Every time, it takes just over 5 quarts to fill mine ALMOST to the second hole. Can't explain it, don't know why, but at 60k miles, it's purring like a kitten.
BTW, ALL internal combustion engines will use a minute amount of oil. One that is in good repair (ie, strong rings and good cylinder walls, good valve seals) will use so small an amount that if the oil is changed at regular intervals, you'll never run low. It's inherent to the basic design of the engine. It is incorrect to say that an engine should burn ZERO oil. That said, when using synthetic, typically you'll drive further between oil changes so you should keep an eye on level until you get a feel for how your car reacts to your particular driving conditions.
PWP 6MT w/navi