Transmission oil leakage

Yes, that's a vent hole. If there is too much fluid, as it heats up, it can spill out of that hole.

Doesn't the 6AT have a dip stick? Just check the dip stick.

Hudouc said:

Doesn't the 6AT have a dip stick? Just check the dip stick.

Click to expand...

of course it does but just being in range is Ok?
The wasted oil is not important?

If all that fluid leaked out, and the dipstick still shows the level in range, it was probably over filled. Was a transmission service performed recently?

A lot of people end up overfilling these ATs because of improper level checking procedure. The level must be checked with the engine warm but turned off.

0dyfamily said:

This.

@Ghsouri , your situation has all the indications of an ATF overfill causing this problem.

• Too much ATF, upper surface in contact with moving parts that the fluid in the sump should not be touching.
• Anti-foaming agents in the ATF can only do so much (incidental contact), you start getting air-entrained ATF
• Air-entrained ATF does not exchange heat at the cooler near as well as fluid ATF ... so ATF in the sump gets hotter, and expands, and the air entrained in it expands a lot
• Foaming, expanding ATF makes further contact with moving parts, heats more, expands more, pukes out the vent (that round, black "rubber cap")

@BLCKFLSH is correct. If all that fluid puked out the vent, and the ATF level was good afterwards, you were overfilled.
You may have wrecked your load of ATF by thermal stress. Possibly. Since you don't mention the color of the ATF, and your car never stopped working (it just leaked out this stuff), you may be okay.

OF

Click to expand...

Thanks all for kindly reply 🌷

I changed the transmission fluid 4 years ago.
I know manual says 2.5L is needed but when oil was vacuumed there was about 8 litters .Then he filled with 8L oil.

Ghsouri said:

Then he filled with 8L oil.

Click to expand...

But did he perform the level check procedure per the owner's manual? (as mentioned by @WiiMaster earlier)

OF

Although the color rendition on my monitor could be questionable, that doesn't have the normal color of ATF fluid I would expect. Even burnt ATF. The following premise is based on the photos.

I believe the ATF fluid would be pushed out the vent under expansion pressures but if this ATF was replaced 4 years ago and was overfilled back then, the OP would have experienced more damage long ago (unless the car doesn't get used often) causing shifting problems with the transmission.

As described in his scenario near 100mph at 100F, uphill causing huge engine load, in that location I would also investigate the possibility it's the engine oil being sprayed out from somewhere. Some seal popped due to excessive engine pressure caused by a blocked something or another. IMHO

@Ghsouri can you take a white paper towel or rag and check the color of the fluid? There should still be a red/pinkish tinge to it still.

Do you know the engine oil level?

Miker said:

Do you know the engine oil level?

Click to expand...

Good catch! If the ATF was overfilled, who's to say the engine isn't also overfilled.