Changing the Transmission Fluid in an Aston Martin DB9

Hello readers. I’ve just released the epic 7 part video series (epic to me at least) on how to change the transmission fluid in a DB9 fitted with a 6-speed automatic Touchtronic II transmission. Most DB9, DBS and Rapide’s from 2004 to 2014 were fitted with this transmission.   

As a primer I recommend you check out my previous article “The Aston Martin DB9 Automatic Transmission” that I wrote at the beginning of this journey nearly 2 years ago.

This process of changing the fluid and servicing the seals isn’t all that difficult if you prepare for the task ahead. It is a bunch of work, but well within the range of home mechanic with a basic set of tools whose willing to get a little oily. If you prepared, you should be able to tackle it in about 4-6 hours, a comfortable weekend in the shop fiddling with the spanners (fun!).

The Official Guides

As usual I started the process off by researching the ‘right way’ as much as I could. While I looked at a ton of materials as I nailed down the process I describe below these two things mattered most.

The Official Aston Martin Workshop Manual Section 7.01 Automatic transmission actually contains a better than average description of the process. Not entirely correct, but a good start. You can read the information here. One of the most daunting steps that they lead off with is ‘Remove the Right Hand Exhaust Pipe’. Yikes!  The good news is that you can accomplish the task with it in place, and can skip that step. In fact Aston just cribbed their instructions from the company that makes the transmission for them – ZF.

I then tracked down the official ZF 6HP26 service guide. You can read it here. They provide a much clearer and comprehensive set of instructions one you figure out their guide. I’ve boiled their process down into my instructions below.




I also found a ZF ‘presentation’ that appears to be something used in a “Train the mechanics” scenario (which was terrific). It covers the process listed in the ZF Service Manual, but augmented and laid out with interesting photos and facts (find it here).  Again, I absorbed this into my process below.

Ultimately it was pretty clear what needed done and how to do it properly. If you trust me that I did all the research right, the official Aston1936 guide is presented below for your use [and I request your comments to further refine].

Aston1936 Guide

I’ve distilled the information of the Official Guides and combined it with my experience to create the detailed steps needed to do the work on the DB9.

While the video series (presented below) is an epic 2+ hour journey in detail through the four phases of the project (prep, draining, assembling, refilling) I am going to make my own life a bit easier in the written articles, covering each step individually and linking them together so you can follow along like a workshop manual. This main article will be serving as the ‘Index’ and below are links to all the steps:


I’ve collected all the related videos together into a single playlist on the Aston1936 YouTube channel. Honestly if you are going to undertake this project, I’d suggest you watch the entirety of the series as it will save you more time (and struggles) than it takes to watch. You can find it here.

7 thoughts on “Changing the Transmission Fluid in an Aston Martin DB9

  1. Gary Knox

    Thank you Steve. As usual, very thorough and informative. I will change my ’09 trans fluid in a few weeks, or maybe wait until spring, as the car will be stored all winter. These videos will be very helpful.

    Looking forward to seeing the remainder of these great videos.


  2. Abe kohl

    Once again, Thank you Steve! I ordered most of the transmission parts when I purchased my coils, plugs, intake gaskets , PCV piping and valves.
    Can’t wait to get started.


    1. Gary Knox

      Steve – Thank you immensely for this great ‘how to’ production (both prose and video).

      I completed my purge about 2 weeks ago, but won’t be driving the car for at least another 6-8 weeks (30″ of snow over the past 21 days). I had the same issue Gary Rouse mentions. Only 1st and 2nd gear would engage during the re-fill and final fill. May be a modification associated with later cars – mine is a 2009 DB9 Volante.


      1. Gary Knox

        Addendum,: The transmission functions perfectly after the purge and minor maintenance service (filter, mechatronics, etc.). Highly encourage getting this done, or doing it for any car at or over 8 years since last purge.


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