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IMO, there is no advantage to the "progressive" fluid change. At a minimum it means a lot of extra, messy work. Plus there is a real risk of damage to the pan when fighting the (usually tightly-frozen) dipstick coupling.
I believe that any sludge in the pan will stay harmlesly where it is. And I have never seen anything in the filter screen worth the effort needed to look at it. So I don't look anymore, after learning of this Technical Service Bulletin:
TSB 17106, Dec 1990
"ATF filter cleaning deleted"
for 200/700/900
for all those AW 70/70l/71/72L transmissions
and for ZFHP22
(Does NOT apply to BW*)
"It is NO LONGER REQUIRED [capitalized in original] to clean and inspect the Automatic Transmission Filter..."
--
Bruce Young '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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