Is it necessary to change the transmission oil at 40,000 kilometers?

Is it necessary to change the transmission oil at 100,000 kilometers? I'm worried that the new oil might not be as good as the original old oil inside.

My car has done 40,000 kilometers, and I feel like there's an issue with the transmission. Have any of you changed the transmission oil or had it checked? Looking for advice.

Does a 2021 car with 55,000 kilometers need a transmission oil change? 😊

Is it necessary to change the transmission oil if there's occasional delay and jerkiness when shifting at 35,000 km over 3 years?

Is it necessary to change the transmission oil at 40,000 kilometers?

Q: For the Taurus 8AT transmission, is it necessary to use a circulation machine to change the transmission oil? Is it required to remove the oil pan for cleaning?

Has anyone with the 2019 GA6 changed the transmission oil? Is it necessary to change it?

How many kilometers should you typically change the transmission oil?

When did you all change your transmission oil, and at how many kilometers?

Hello everyone! Is it necessary to change brake fluid every 40,000 kilometers? How should I choose brake fluid? Which brand should I choose?