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!
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never flush a transmission, only drain and refill the fluid believe me it’s plenty enough for a transmission. they’re super sensitive and can very very very easily get damaged if they are flushed. if you do it yourself, measure how much fluid came out and put the same amount back in that way you don’t have to guess on the level because unfortunately most transmissions nowadays don’t have dipsticks. also buy the fluid straight from the dealership, you really don’t want to mix fluids. yes it’s a bit more expensive but your transmission will be very happy
never flush a transmission, only drain and refill the fluid believe me it’s plenty enough for a transmission. they’re super sensitive and can very very very easily get damaged if they are flushed. if you do it yourself, measure how much fluid came out and put the same amount back in that way you don’t have to guess on the level because unfortunately most transmissions nowadays don’t have dipsticks. also buy the fluid straight from the dealership, you really don’t want to mix fluids. yes it’s a bit more expensive but your transmission will be very happy
As an auto tech, I would not recommend a transmission flush. Drain and refill and as the other person mentioned use factory fluid.
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.
Your owner’s manual will likely say “fluid change” not “fluid flush”. So do that.
It will also have the type of transmission fluid to use. DO NOT use any other type. You may be able to use one of a few different brands. But the type must be the same.
More info on ZF8 here.