[romanzdk]

Can AT oil be changed at home? Do I need some special equipment? Or just drain plug (out), fillin the oil, measure the temp using some diagnostics and thats it? (F48, 8 gear AISIN AT)

[knightarmor]

Would also be interested in knowing if anyone has done this at home. On our Volvo's and Nissan's I'd just drain, fill, disconnect one of trans cooler hoses, turn on the vehicle and let it pump out the fluid until it stopped. Turned vehicle off, refill and repeat process until the clean fluid started pumping out.

[romanzdk]

Based on my research I decided to do it on my own. Just ordered the fluid.

What I did:

1. Check what gearbox I have - check car documents, realoem, contact dealer - GA8G45XAW
2. Get workshop manual (ISTA)
3. Check whats the procedure for AT fluid change
4. - basically drain, fill up until overflow plug drains oil, go through each gear for 2 seconds, increase temp to 35-45°C, fill up the oil again, wait for overflow, done (correct me if I understood it incorrectly, please)
5. Check what fluid I need - BMW ATF 7, 83 22 2 413 477
6. Ordered 4 liters of the fluid, will do the change

[curcino]

I have done this recently but with "washings". Each time i had opened the drain i have got 3 liters out the gearbox. So i put 3 liters of new fluid, ran the vehicle into every gear then drained again. Repeated three times and this was my result (see picture).

1st - factory fluid (2017 car, changed 2023 with aprox 40k km)
2nd - first washing
3rd - second washing
4rd - third washing
5th - new fluid for comparison

will do it again but one 3L change in one year.

[romanzdk]

curcino would you mind describing the last step? did you just fill the fluid, wait for 40°, shift through each gear, fill again, take out the overflow plug and thats it? I just do not understand one of the last steps in the official workshop manual “Top up automatic transmission fluid until it flows over.”

also how is the transmission after the change? is shifting smoother? everything alright?

[curcino]

Originally Posted by romanzdk

curcino would you mind describing the last step? did you just fill the fluid, wait for 40°, shift through each gear, fill again, take out the overflow plug and thats it? I just do not understand one of the last steps in the official workshop manual “Top up automatic transmission fluid until it flows over.”

The last step is for adjusting the fluid level. if you open the small plug and nothing comes with the gearbox at 40c you need to add fluid. You open the small plug when the gearbox is at 40c and let it flow the excess fluid in the system. when it starts to drip you put the screw back.

the engine temp is not the same as gearbox temp. keep it in mind.

Since i had no leaks and measured with a flask in every change and put back exactly the same ammount the gearbox let out i had no need to do the last step for measurements.

i also added a lubegard platinum additive. it helps the oil to produce less foam.

and yes after changing the fluid the difference is notable. very smooth gear changes and the feeling that i will not service the gearbox about failures in a long time.

[romanzdk]

Thank you curcino . Did you also perform reset of adaptations or it is not necessary?

[Zix]

Sorry for the use of original post but the matter is almost the same !

I am trying to discover for sure if this gearbox is meant to keep the filters when you change the oil if you don't open it up ?
Seems the two filter I can find are both inside the carcass...

My car as almost 170k and from what I can see in the menu, it has always been serviced in the dealer with no mention on that oil change!!

cheers

[Zix]

So nobody has a clue...
ok...

[curcino]

Originally Posted by Zix

Sorry for the use of original post but the matter is almost the same !

I am trying to discover for sure if this gearbox is meant to keep the filters when you change the oil if you don't open it up ?
Seems the two filter I can find are both inside the carcass...

My car as almost 170k and from what I can see in the menu, it has always been serviced in the dealer with no mention on that oil change!!

cheers

In my opinion at 170k with factory oil the filter must be saturated and needs replacement. For less used cars the oil change prevents the build-up on the filter and the owner can postpone the substitution.

[Zix]

Thank you for your reply.
Yes, I can understand that...
But the thing is, in this specific gearbox Getrag 7DCT300 does the filters lay inside the box ?
I can see they are two distinct filters...

[curcino]

It usually do. But cant say for sure since i only know about the aisin 8 gears and aisin 6 gears