Don't use ATF. It produces a bunch of ash when it burns. Not exactly what you want…

FCPeuro.com has all the Liquimoly stuff. I've had good luck buying from them.

An engine flush would go into the crankcase and only be there for a few minutes. I don't see the reason for a concern about ash.

Now if we were discussing fuel system cleaners....

I see your point but I don't think they put a time limit on ATF in the crankcase and you're going to get some blow by.

Besides, everyone knows that you put automatic transmission fluid in power steering systems, like dog intended! :rofl: