What's the point of FSM tranny service procedure?

Joined
May 24, 2005
Messages
731
Location
Bonsall, California
The changing transmission oil topic has been covered extensively and it is well recorded here that to exchange 95% of the oil in the torque converter the sump oil needs to be changed, as per the FSM, sixteen times. I have never seen any opinion as to why, this being so, that the FSM instructs this minimalistic procedure. What good does the change as per the FSM do other than to drain out any sediment in the sump, or is this the idea of this service?
 
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