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(Disclaimer: I am a geek.)

So I am flushing my transmission fluid using the so-called 'turkey baster' method. I get to wondering how many bottles of Mobil 1 ATF I should buy to replace most of my fluid using this technique.

So I created a little spreadsheet to work out what percentage of fluid is replaced after one, two, three or more flushes. Based on my experience, a 1 litre bottle of ATF is enough to refill the completely drained reservoir three times, so I am assuming that it is possible to get 0.33 litres of new fluid into the system each time. I have not been able to find a definitive answer to the total system capacity but based on a few posts I have found I believe it is a little less than 2 litres, let's say 1.5 litres.

I would attach the spreadsheet, but I don't think .xls attachments are allowed here.

But assuming 0.33 litres reservoir and 1.5 litre system capacity, here are my results. The left column is the number of times the reservoir has been emptied and refilled, the right column is the percentage new fluid in the system:

1 22.00

2 39.16

3 52.54

4 62.98

5 71.13

6 77.48

7 82.43

8 86.30

9 89.31

10 91.66

As you can see, you run into diminishing returns because after a while you are removing more new fluid than old. The reservoir capacity is 22% of the system capacity by my numbers.

So after one bottle of Mobil 1 ATF we have replaced 53% of the fluid, and after two bottles 77%. Three bottles would get me up to 89% new fluid.

(Told you I was a geek.)