[Sumedik]

Originally Posted by purohitanuj

I got my 6 speed AT valvebody serviced due to stuck solenoids, which was due to Mahindra not flushing ATF in any of the service schedule.

Where did you get this done?

Originally Posted by Sankar

For reliability sake another preventive maintenance that can or should be done (on the keepers) is to have an external fluid-to-air transmission fluid cooler installed bypassing the stock cooler which would be fluid-to-coolant type of cooler.

I wonder whether this can be done in India at all ! Also after the bypass, the ATF has to be flushed or drained and filled multiple times to ensure no coolant remains in the ATF, in case a leak is suspected.

Originally Posted by purohitanuj

I see this against right to repair. Basically, the so called "Sealed for life" is relative term. I did some digging and the results are surprising.

See the service manual (DSI M78 6 Speed AT) page A:
It says that the gearbox ATF is sealed for life.

Attachment 2393357


In the same service manual, page B states Oil Change Schedule:


Attachment 2393358

Now what I understand is "Sealed for Life" is a marketing term. These companies assume that an average Joe would run is car for about 30,000KMs in this life time.

This is completely rubbish!

Another point to note is that many would not drive 30K in warranty period. So the manufacturer would want the gearbox to fail post warranty so more mulah can be milked. This treand is very unethical.

We should raise voice against this. All manufacturers should term the "Sealed For Life" in terms of KMs or Years or better both.



As I have said, changing the Oil is like replacing 30% bad/burnt ATF with 30% new. Proper way is to change at 30K and flush at 70K. No two ways about it.

Note from Support: Kindly use the Quote+/Edit functionality to quote multiple posts.

Originally Posted by ritedhawan

Another particular tell tale sign of something up with conventional AT's:
Usually there is sufficient crawl associated with conventional AT. For example, car on level surface and you select 'D' and without stepping on accelerator, the car should begin its usual crawl. Therefore, a car exhibiting diminished crawl or non-existent crawl is a tell tale sign of something up with AT

This is a great test, however other factors like temperature, tyre pressure, engine condition needs to be controlled as much as possible to get accurate results.

Originally Posted by sagarpadaki

Your car transmission is overdue for an oil change at 9 years despite the low mileage.

Ideally after how many years should ATF be changed irrespective of milage?

[DCTfanatic]

Has anyone had an ATF change for their Hyundai/Kia 6-speed TC transmission yet? I dont seem to find any mentions of such an instance on this forum.

My 2019 Seltos D AT is near the 50k mark and the AT has been acting up in the last 8k km. Jolts while upshifting on par-throttle/letting off throttle at shift point, cutting power when dabbing throttle more right after upshifts and jerking/oscillating the whole car harshly like clockwork when you let off the brakes in 1st gear and the car is crawling at 7 kmph.

Would a ATF fluid change help with the same?

[Naetik30]

Originally Posted by DCTfanatic

Has anyone had an ATF change for their Hyundai/Kia 6-speed TC transmission yet? I dont seem to find any mentions of such an instance on this forum.

My 2019 Seltos D AT is near the 50k mark and the AT has been acting up in the last 8k km. Jolts while upshifting on par-throttle/letting off throttle at shift point, cutting power when dabbing throttle more right after upshifts and jerking/oscillating the whole car harshly like clockwork when you let off the brakes in 1st gear and the car is crawling at 7 kmph.

Would a ATF fluid change help with the same?

Hyundai ATs + the issues you have mentioned could also be due to issues with the injectors. Especially the jerking/clockwork oscillation. Recommend to get this checked out.

[DCTfanatic]

Originally Posted by Naetik30

Hyundai ATs + the issues you have mentioned could also be due to issues with the injectors. Especially the jerking/clockwork oscillation. Recommend to get this checked out.

50k service is due next week. ATF fluid check on the list of requests. Adding injector check as well. Anything else powertrain related that might be a cause of these issues?

[Naetik30]

Originally Posted by DCTfanatic

50k service is due next week. ATF fluid check on the list of requests. Adding injector check as well. Anything else powertrain related that might be a cause of these issues?

Injectors issue is not easy to diagnoze and Hyundai ASS will try to say everything is fine. An easy way to check would be to replace the injectors with their test drive cars and try to reproduce the issue.

[DCTfanatic]

The jerk/oscillating issue is very easy to reproduce for me. It also occurs at specific rpm points in specific gears while holding a certain amount of throttle. Have figured them all out due to facing this issue for almost 8k km in the last 6 months.

Will take a test drive with SA and a technician. I have a good/feared reputation with my local Kia ASC. Have dealt with a lot of issue and made them admit to incompetency multiple times. They have gone as far as to permanently assign their SA Head as my point of contact.

[purohitanuj]

Originally Posted by DCTfanatic

The jerk/oscillating issue is very easy to reproduce for me. It also occurs at specific rpm points in specific gears while holding a certain amount of throttle. Have figured them all out due to facing this issue for almost 8k km in the last 6 months.

Will take a test drive with SA and a technician. I have a good/feared reputation with my local Kia ASC. Have dealt with a lot of issue and made them admit to incompetency multiple times. They have gone as far as to permanently assign their SA Head as my point of contact.

Do whatever but do not let the service people run learning from the VCI software. I know many instances where a learning request with degraded performance have doomed ATs. If its in warranty, you may go ahead but else be very cautious of what the service people do.

The issue with learning is that the AT hardware is generally performing outside the spec ( as it has degraded a lot ), and then the learning algorithm goes haywire in response to achieve timings of solenoids for smooth shift. This is similar to cases where people generally do not change ATF of very old, ill maintained ATs as it also has a similar effect.

[DCTfanatic]

Originally Posted by purohitanuj

Do whatever but do not let the service people run learning from the VCI software. I know many instances where a learning request with degraded performance have doomed ATs. If its in warranty, you may go ahead but else be very cautious of what the service people do.

The issue with learning is that the AT hardware is generally performing outside the spec ( as it has degraded a lot ), and then the learning algorithm goes haywire in response to achieve timings of solenoids for smooth shift. This is similar to cases where people generally do not change ATF of very old, ill maintained ATs as it also has a similar effect.

This is my primary fear as well. Worse is the fact that the car is now out of warranty. Anything the ASC suggests as a potential solution or fix is all on my cost and risk.

I am thinking of not doing anything if their solution is anything more drastic than a simple ATF change. Instead get a normal oil change and then shift to a synthetic oil/5000km change cycle. I have noticed that post oil change, the issue becomes very negligible and then starts creeping back post 5000km on regular mineral oil.