Transmission Flush - Do or DON'T??

[mejim707]

So after totally derailing this post because of that phantom failure of the O2 sensor, and now that I have that fixed, the car is running beautifully. So I'm back to my original question, should I or should I not proceed with a transmission fluid change?

As mentioned, the X has 255k on the clock and the original fluid. It runs and drives mint! But I fear if I drain the fluid, and add new fluid that the transmission will begin to slip.

I know some say that there's a certain group that says no matter whet milage, change the fluid! But what are your thoughts?

I'm leaning toward doing it, but, I wonder if perhaps I can pull the fill plug, suck some fluid out, then have the fluid tested before proceeding with the full change. This will only loose a little fluid but will show if it's filled with friction material? Thoughts on this?

Thanks!