Contour Enthusiasts Group Archives Forums Modifications Transaxle is my atx going

I had the power flush performed at 30k with no problems following. I was considering having the flush performed again, but after reading many posts on the subject, I am now leary. I guess I will do the four quarts at oil change and see what happens. I read the posts concerning "transfusion" but did not see the answer to my question: Is there a problem mixing the Mobil 1 with whatever is in my tranny now? I know mixing regular motor oil and synthetic is bad. Is all tranny fluid synthetic?

Thanx, Joe

Well I have performed several searches and reread almost 50 post and can not find anything. I did find where "twowheelin" asked about the conserns of mixing syn and nonsyn fluids in our ATX and got ZERO response. I even checked the Mobil 1 site and found that they do not even have a FAQ on ATF. They do on motor oil, but not ATF.

I know I read somewhere here in the forum that it was not a good idea, but I cannot seem to find it. Bearing in mind that I have only cup of coffee down my neck at this point so I am a little slow.

I am goind to stand by my original statement as not to mix them, even though I do not have the proof to back it up, because to me it just seems like commensense. Why? Becasue syn blends of lubes are not exactly the same as plain oil. I know that you can safely mix synthetic motor oils, still not a great idea since you are basically throwing away money, but I know I read here that you should not mix synth and non-synth ATF. Where is it!!?? It must be located in a different topic thread and we just happened to wonder into a conversation about mixing ATF. Who knows!

Cool, that's what I thought. I'll just stick with the regular for now. Trying to buy a Condo and save as much as possible!

There is no problem with mixing Non and Synthetic fluids of any kind, whether it is Motor oil or ATX oil.
The problems come into play with SEALS and Oil.
Worn selas tend to LEAK more with Synthetic Oil than Non-Synthetic.
This is mainly because the molecules of Synthetic Oil are much smaller and uniform
than the molecules of Non-Synthetic Oil.
If your tranny has a few miles on it and you want to switch to synthetic
you should be fine and not have any problems.
If you tranny has a LOT of miles on it, switching to synthetic may be a bad idea.
Synthetic oil may run cooler, but on an older transmission may also cause internal oil pressure leaks.

I've said this in an earlier post, and I'll say it again since no one has said different.
This doesn't mean I'm right about this either, but it makes sense to me.
I have a very strong feeling that all ATX Oil is synthetic mainly because it is a hydraulic oil.
It just comes in various grades, and follows newer technological standards.
Some of the newer standards will work in low mileage transmissions, and rebuilt transmissions,
but I would stay away from them with an older transmission, at least until it is rebuilt.

The CD4E is a 1993 - 94 design transmission.
This falls into the Mercon group.