Have a BMW 2017 M140i with a ZF 8 speed automatic gearbox. Bought it a couple months back and it is currently at 95K KM mileage. Almost guaranteed that the previous owner did not do any maintenance work on this car. I had the engine oil changed but I am wondering should I flush or change the transmission fluid? Have read a bit about full flushing causing slippage issues hence unsure if I should proceed.

Any advice? Thanks!

  • alwausBEnglish
    1·
    10 months ago

    Dont flush a transmission.

    Have the pan dropped and cleaned and the filter changed.

    Flushing just stirs up crap in the pan and clogs the filter, dead transmission.

    Add 20oz of a friction modifier to the transmission then top it up with the recommended fluid, adds back the “stiction” the old contaminated fluid had, keeps the worn bands and clutches working.