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Message: <blockquote data-quote="Richard L" data-source="post: 541839" data-attributes="member: 52972">Caymen,Yes one could always agrue that a tranny flush is better than a conventional fluid change or that the change is better than the flush.  That's what this whole discussion is about...Is it really necessary to change the transmission filter if the fluid is flushed at regular intervals of 25-30K milesI agree that the 5R55E "Filter" is filtering smaller particles and so it is doing a better filtering job than the coarse mesh found on many transmissions.  The point of changing any filter is that over time it becomes saturated with harmful contaminates that have been removed from the fluid or gas it was filtering.  My argument is that transmission filters are not designed to retain these contaminates.  They are too small and too coarse to do that effectively.  So if you flush the fluid and replace 97% or more of the old fluid you are removing the vast majority of the contaminates cirulating in the fluid.  Yes you should replace the filter after every 3rd or 4th flush just to remove the build up of debris in the pan and in the filter....Rich</blockquote>