The BMW E46 is generally regarded as a reliable model overall, but it's important to note that reliability can vary depending on factors such as maintenance history, driving conditions, and individual vehicle history. That being said, the following E46 models are often considered to be more reliable:
BMW 330i: The 330i is powered by a 3.0-liter inline-six engine, which is known for its durability and smooth performance. This model generally has fewer issues compared to the higher-performance M3 variant.
BMW 325i: The 325i is equipped with a 2.5-liter inline-six engine and is often regarded as a reliable choice among the E46 lineup. It offers a good balance of power and efficiency.
BMW 328i: The 328i is powered by a 2.8-liter inline-six engine and is known for its reliability. It offers a good combination of performance and fuel economy.
It's worth mentioning that proper and regular maintenance, including scheduled servicing, is essential for maintaining the reliability of any vehicle, including the E46 models. Additionally, when considering purchasing a used BMW E46, it's advisable to have a thorough inspection conducted by a qualified mechanic to assess the vehicle's condition before making a decision.