First thing - there are at least 10 different transmission fluids on the market. They are not necessarily compatible. It just isn't good policy to mix fluid types or to use a different fluid than what is recommended by the manufacturer.
Second thing - There is NOTHING short of a complete disassembly and a replacement torque converter that will remove and/or replace 100% of the old oil. Why? Because there are too many places in a transmission for oil to "pool" up and lay. There is no way to effectively flush out a clutch drum or servo completely. Oil goes in and out the same place. Some oil will ALWAYS remain in a servo or clutch drum. Many parts in the transmission rely on splash for lubrication.
Third thing - oil. Transmission flushing amounts to connecting a machine to the transmission cooler lines. Oil is pumped out by the hydraulic system and "replaced" by oil from the flushing machine. The oils will MIX. Assuring a complete exchange of fluids is virtually impossible. There will always be some residual original oil left in the transmission. Even if you pumped a whole 55-gallon drum of it through the transmission.
Last thing - oil compatibility. What kind of oil is being pumped into the transmission being flushed? Is it the CORRECT oil for the unit being flushed? Given that there are many different oils in use today, what is in the machine? Unless the machine is used exclusively on one make of car, I would say that the odds are pretty high that the oil is not correct.
In conclusion, my humble opinion of transmission flushing is that it is a rip-off that can potentially damage your transmission. Claiming 100% oil replacement is simply fraud.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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