Transmission Fluid Leaking Problems of BMW 750

I purchased the 2010 BMW 750 li in oct 2017. In April 2018, I began to have issues and messages constantly popped up concerning engine temp drive moderately and drivetrain malfunction. I kept the car's maintenance up, however, even a week after an oil & filter change, I'd get the low oil warnings & needed to add oil constantly. Oil was leaking bad. The car would get up to 35-40 mph (between 1 & 2 rpm) & start shaking or wouldn't shift over. I'd have to press accelerator down to accelerate to atleast 70 mph so the shaking & vibration could stop. The car was taken to a BMW repair shop in 08/28/2018. Ignition coils, spark plugs, oil change, filters, all were replaced. Brake fluid was flushed as well. The oil issue never stopped. After months of adding oil every few days, the car was taken back to the BMW shop (April 2019). At that point, I was told to take to the BMW repair shop dealership, where they diagnosed & they performed the n63 engine recall repairs in may 2019. The smoking subsided, but in July 2019, the car was back in BMW's repair shop because it had now gotten the same readings but it had also begun to smoke badly, upon starting, stopping at traffic lights or stop signs. Along with engine temp lights, and drivetrain malfunction. The car was repaired again. Engine temp light came on every day as soon as I crunk the car. The service manager told me it would go off in July 2019, after the repairs. December 2019, engine temp light is still on. Again, several lights are now on. Drivetrain malfunction also and the car is not shifting properly, as before. It's vibrating at 35 mph. Because it's the holidays, the BMW dealership and service department are closed. First thing tomorrow, I will be back there. I have to work and afraid that the car will eventually give out on me. It's all I have. I'm basically working to fix the car!.

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