.

I admire your restraint.

 And then... along comes

Oh.......don't feel bad. I doubt the OP understood my comment, anyway. ;-)

Dave

Actually, I hope not.  If you think about it that principle of operation
would be quite disastrous to a normal running tranny.  Agitating the
particulates in the tranny pan by running the engine would circulate them
during normal driving, as well.  I would not  want that.  Agitating
particulates for the purpose of running them through the closed loop system
in the hope of capturing them in an external device is risky at best.  The
Snap On device will capture what makes its way to it, but stirring that
stuff up (if indeed the Snap On flush is capable of doing that...) will
certainly result in the stuff getting spread throughout the system and
caught in the system - not the flush system.  But... even giving the benefit
of the doubt to the Snap On system, it's not going to get the stuff out of
the filter and it's not going to get the metallic particulates that are
captured by the magnet.  There's only one way to address those two factors.

Dealerships very often use what is convenient for them and not always what
is best for your car.  Sorry, but it's a hands down no-brainer that to
remove the pan and filter, and to manually clean the pan and replace the
filter, followed by a normal flush using just the tranny pump as the flush
pump, is going to give you a far better flush and replacement process than
the Snap On system is giving you.

Dave is right - you are leaving a dirty filter in your car.  And you are
leaving the stuff in the pan.  To each his own, and the flush job you got
did at least flush out the most of the fluid in your car, but don't place
blind faith in things that you clearly don't understand.  Though it is fast
and convenient, it's *not* the same as a manual job.

It never ceases to amaze me when someone goes to the trouble of posting
a question, gets the correct answer but doesn't follow it.  Not one
person here has profit in mind when answering questions, yet it is the
man whose mind is on profit that rules the outcome.  A ignorant way to
do things, but 'A fool and his money are soon parted'.  This WJW guy is
obviously a boob and now that he's flaunted good advice/knowledge, he
gets all-defensive with his postings.  I wonder who will get the last
laugh?  The not-for-profit advice givers, the Buick/Pontiac dealership,
or wjw......this doesn't even need a vote, does it?

Dave S(Texas)

Quick Google news search shows you as being an asshat.  Either fix it right
or give it to someone that will.  "If it wasnt legit do you think the
Buick/Pontiac Dealership would be using them"  They don't.  Nor does any
Pontiac dealer recommend such a thing.  As usual you are talking outta your
a.s.

my strategy is to drain and fill trans fluid at about 10K, then every
30 K I open up the pan and clean the gunk off, replace the filter and
clean the magnet. I know I won't replace ALL the fluid in there, but a
part of it is replaced and due to the more frequent changes I do keep
a pretty clean fluid. I don't use any fancy fluids either, just
whatever meets the specs. MY motto is that new fluids is better than
fancy fluid.