Yes indeed, the dealers have been sucking out oil for several years. They do it for the same reason that some of you here choose to suck it out, convenience.

For the dealer it is convenient and more efficient because they don't have to drain oil out of an engine that is about to be taken apart into a pan and then dispose of the oil from the pan. It also allows them to assign oil changes to any of the techs because they all can change oil in their own bay. Before these elaborate sucker systems in the dealers they had to have a grease pit or two dedicated to oil changes. Most of these techs are paid flat rate and don't want ANYTHING to slow them down.

What I DON'T understand is how sucking it out is considered more convenient than draining it out. What is simpler than a drain pan and a box end wrench? Both of these items are almost indestructible under normal circumstances.

I think that the REAL reason that drives the suck it out oil change method for most folks is that they don't like getting their hands dirty.

Again, regardless of your chosen method, just keep it changed. But you should still get underneath the car for inspection regardless of the chosen oil change method. An ounce of prevention is worth a pound of cure.

Have a great day,