Depends on where the drain plug is in the pan. Usually the designers anticipate that people will put the front of the vehicle up in the air to change oil, so the plug is a location to still be at the lowest point if the vehicle is tilted up, it should also be at the lowest level if the vehicle is level.
I've never noticed a difference between jacking the front up or on level ground when it came to oil changes, in all my vehicles. I do NOT have a V8 Commander, though, so maybe it is different.
How long you let it drain, whether the oil is hot or cold, changing the oil filter, etc could effect how much you drain out and thus need to refill.
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