You must have any shop detail their service. For instance, most dealers just drain and refill 4 of the +10 qts. it holds and calls it a "flush."
And just to be clear,
Q45tech wrote:All the flush [should be called fluid exchange] machines depend on the [transmission or power steering or water pump ] to do the pushing/pulling work.The FLUSH part is the chemical solvents detergents which loosen the crud up that the standard fluid has allowed to collect.Wherever there is magnetic material [gears, etc] there is a magnet in each sump [diff, transmission, oil pan] to attract and hopefully hold this worn off material between manual cleanings.
The thread is
zerothread?id=578
To read more, read the recent flush vs. exchange thread in IOM. There is pure gold in the old posts.
http://www.jerrytucker.net
will do it correctly as they learned the difficult way that the internal filter had to be replaced.