You don't need ramps to get under the car, you don't even need a jack.
I simply use two 2X8" pieces of wood 12" long (one under each front tire) with the end cut at a 45 degree angle so the tires roll right up on it.
This raises the front end enough for me to reach everything I need to get to, when ever I change my oil.
I'd still like to know exactly where that illusive "LIP" is everybody keeps talking about. Huudoo, maybe your oil pan has under gone "Collagen treatments".
But the bottom of my oil pan is flat, and the oil drain plug is on the side of the pan. The bottom of the plugs threads line up exactly with the bottom of the inside of the oil pan, and does not create a "lip". I even stuck my little finger inside, and felt no lip.
I've drained my oil at least 7 times, and even after jacking it up on the drivers side no more oil came out.
I personally feel draining from the oil pan is the most effective way to do an oil change on our car. But I can also see how the pump method is easier and faster, (why else would the dealer use it?)
I'm with Cgocifer on this one. But if I changed my oil in the winter, I'd probably use the pump method instead of laying on a cold concrete floor in my garage.