Hello. I've done extensive research on the forum about the problem I'm experiencing, but haven't found a solution. My car is a 2018 model, semi-automatic 2008 1.6 BlueHDi Active, with 60,000 km on the clock. When the engine is warm and running in N, it makes a knocking noise when first shifting into gear (sometimes, not always). It makes this noise in both gears, regardless of forward or reverse gear. Sometimes when I shift into A, sometimes into R. The sound is very disturbing. Sometimes this knocking noise and its impact cause the car to jump. I tried to have a transmission technician at Maslak Automotive Industry listen to the noise, but unfortunately, the technician couldn't hear it because he doesn't always repeat this sound during testing. We took test drives half an hour apart, and he still didn't hear the noise. My research suggests it could be due to aging transmission fluid. Perhaps someone here has some insight into this issue. I need your valuable suggestions and opinions. Thank you.