Originally Posted by BRappaport
I do not recommend using this technique for changing the oil. Sludge and metal particles from the engine go down and collect in the oil pan. These are not flushed out by using the suction technique. That's one of the main things that you need to do to keep the engine healthy...not leaving that debris behind! So warm the engine oil first...remove the filter next...to get all the old oil out...then drain from bottom plug to flush out all contaminants.
Ben
I have a friend who used to sell Mercedes-Benzs and is now a Jaguar dealer manager with the same chain. The MB service department there only used topside oil vacuums on all MBs serviced. Not sure if all MB service departments do it, but I have heard it is standard procedure for them.