Forget the concept of "flush." It's only applicable to your wallet.

On the trans, just drain, replace filter, and refill.

http://www.thecarconnection.com/article/1008972_mechanics-tale-the-flushing-of-america

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles