Hi Guys,I just bought a second hand 318i (e46) year 2001, clocked at 151,000. I'm yet to send my car for a service as what my car agent said is that I can bring the car after 5000km drive.Now, after use it for few days. I found the following problem arise in the car:1. GearBoxI find it's a little hard to transmit the gear from P to D,N and R and recently i can hear a weird "dak-dak" sound from the GB (when i hit the brake and driving).2. Sound from the BeltI can hear unwanted sound from the front part. As of my car agent's advice, he said it is due to the new belts installed and the sound may decrease gradually after the engine gets hit. But i feel it's abit suspicious whether that's the real reason.3. Driving not very stable at top speedWhy i can feel like the car is not stable when i drive above 110kmph? Is it due to the tyre or alignment problem?As of now, these are the problems arise and i'm hoping to get a very good response from the experts here.Thanks