Hello! So, answer is after 75K miles gearbox oil change is a must. I got it, but which oil is better? There is quite expensive BMW "original" fluid, and ZF which 2 times cheaper. I'm asking because here in Kyiv you can buy used working gearbox for 2K USD and change yours broken one for another 200$). And just oil change takes up to 800 USD just for materials and no one guarantee that this will help.
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