Bruce Nunnally Posted January 30, 2004 Report Share Posted January 30, 2004 On one of the description sheets on the new 5-speed auto 5L40-E in the CTS it says The Hydra-Matic 5L40-E uses DEXRON III fluid and is filled for life, requiring no maintenance. In the owner's manual it notes: Change automatic transmission fluid if the vehicle is mainly driven under one or more of these conditions: In heavy city traffic where the outside temperature regularly reaches 90F or higher In hilly or mountainous terrain When doing frequent trailer towing Uses such as high performance operation If you do not use your vehicle under any of these conditions, the fluid and filter do not require changing. If you do, it shows it on the schedule every 50k miles. Wags in the audience may argue that it requires no maintenance for the life of the tranny, and requires maintenance at 50k indicates that the tranny will only live through the 50k warranty in heavy usage Still wish they had enabled the available tap-up and tap-down feature in the CTS, but I suppose that would cost more. Bruce 2016 Cadillac ATS-V gray/black Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
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