M235i, 8AT, 32K miles. Bought it CPO with 28404 miles two months ago. Just had the 10K miles dealership scheduled service about 3 weeks ago (oil change, scope check, vehicle inspection report).
In sport mode, I've noticed a slight rattle and ticking sound from engine/transmission when accelerating lightly with paddles. Don't really hear it at highway speeds, more noticeable on quiet roads. Shows up just around 2-3K RPMs under light acceleration blips, especially around 30-40mph in 2-4th gear. Don't really hear it in auto mode since the car usually shifts itself before 3K.
Did a ridealong with a BMW tech at a local dealership today and he said the light ticking sound is normal and is VANOS operation. Just wondering if anyone else has heard something similar.
Here's a video - driving low speed between 1st and 3rd in paddle mode, accelerating slowly (few inches down on the pedal), doing no more than 3K RPM. It's that slight rattling/buzzing sound as the revs go up.