Join Date: Feb 2011
Location: Ventura, CA
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There is a significant difference between the flush machines and drain and fill servicing. The flush machines can replace all of the fluid, both in the transmission and the torque converter. The TC holds as much or more fluid than the transmission does in most cases. A drain and fill only changes about half the fluid. Of course it eventually gets mixed with the TC fluid as you drive. Changing some of the fluid is better than none.
Curious about why one should stay away from the flush machines, other than for cost reasons?
On the Toyota's I've serviced changing the filter turned out to be a waste of time because they were just relatively course wire screens and always appeared pretty clean, even after 50K miles. I've had other cars with a paper element transmission filter and I can see changing those as they tend to catch a lot more grit and actually look dirty when they come out.