I've NEVER and I repeat NEVER used the vacuum method to remove engine oil. I was a dealer for 20 years and we never found any advantage to it. Like nearly everyone is saying, you can't get the oil completely out and the oil drain plug does. I will disagree that the vehicle IS NOT designed for this purpose, the pan has a low area where the drain plug is located.
So, use whatever method you like. I'll stick to what works.
I'll stick to what works too thank you
I have listened to this debate over and over over many years.
it's like "what kind of oil should I use?" Dino or Synthetic?
People who have used the suction method correctly and then as an experiment undid the drain plug and nothing comes out but this applies only to Mercedes-Benz. I tried it on a Toyota and residual oil out the drain plug.
And, as I have said before, the suction method does not work for most cars, but Daimler has always (in recent memory) made sure the deepest point of their oil pans is always below the dipstick tube.
But as others have said, use whatever method floats your boat.