MyFirstSHO:
I keep checking this thread for that, "My SHO went BOOM" post.
Nah but seriously SHOmav24v, When you do pour foreign fluids into the crankcase its just like opening a can of worms. You could loosen up decent sized chunks that could end up restricting oil flow, and then SHO-BOOM. Or that nice ATF (or seafoam, whatever) wont provide enough load-bearing protection, and then SHO-BOOM.
The one and only time I used/will ever use Seafoam, is on a last ditch effort to pass emmissions (after everything else is in proper working order) or on a motor that I just dont care about. I used it on my 170k mile small block chevy 2 summers ago. All it did was Leave a MASSIVE cloud of smoke for about 20 miles straight (Yep, 20 miles). I didnt notice any difference except for the black film of oil on the back end of my monte when i was done.
ATF is more of a Penetrant than a Lubricant.