Hi everyone,

I recently bought a 2010 Corolla SEG automatic with about  118k miles. The car runs fine, fuel economy is within the expected range, and I don’t notice anything abnormal from the transmission.

The only thing I’ve checked so far is the transmission fluid, and it looks dark. Unfortunately, I don’t have much maintenance history from the previous owners.

Should I replace the fluid now? If so, would you recommend a partial change or a full flush with new filters? I’ve heard that sometimes transmissions “get used to” the old fluid, and a complete change might cause issues or even premature failure if it hasn’t been maintained regularly.

Any advice on what to expect in terms of maintenance for this model, especially regarding the transmission, would be greatly appreciated.

Thanks!