Quote:
Originally Posted by speeder
The only motor flush I would ever do is add a quart or two of ATF and drive a few hundred miles before draining it. Having torn down more engines than I can count, the only place I ever see appreciable amounts of sludge is in the oil pan.
If you wanted to really clean the insides of the engine, the best way would be to shut it off hot and let it sit for hours, then drain it and drop the oil pan. Clean the oil pan in your parts washer until it’s spotless inside, rinse it with fresh water and let it air dry before reinstalling it. There is always some real crap in the pan that does not drain unless the engine has been maintained like Air Force One.
I always change oil hot but I do it on time and let it drain for a very long time. The bottom line is that it takes a long time for all of the dirty oil to drain into the sump and if you just shut it off, you’ll never drain it all. The absolute best way is to drain it cold and remove the pan if you are trying to get the dirt out.
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Amsoil disagrees with using ATF for engine flushes.
https://blog.amsoil.com/transmission-fluid-as-an-engine-flush/