The most reliable engine for the BMW E90 is generally considered to be the N52 3.0-liter inline-six engine. This engine is known for its smooth power delivery, good fuel efficiency, and overall durability. It is less complex than some of the turbocharged engines found in the E90 lineup, which can lead to fewer potential issues over time. Overall, the N52 engine is a solid choice for those looking for a reliable option in the BMW E90. **

The BMW E90 petrol engine typically comes with either a 4-cylinder or a 6-cylinder configuration. The 4-cylinder engine is more common in the lower-end models, while the 6-cylinder engine is found in the higher-performance versions. Both configurations offer a good balance of power and efficiency, catering to different preferences and driving needs. **

The engine in the BMW 325i E90 is a naturally aspirated inline-6, while the engine in the BMW 335i E90 is a turbocharged inline-6. Generally, naturally aspirated engines tend to have a longer lifespan than turbocharged engines due to the added stress and heat generated by the turbocharger. Therefore, the engine in the BMW 325i E90 is likely to last longer than the engine in the BMW 335i E90. However, proper maintenance and driving habits also play a significant role in the longevity of an engine. **

The BMW E90 with a diesel engine benefits those who prioritize fuel efficiency and torque, making it a good choice for long-distance driving and towing. On the other hand, the gasoline engine option is better suited for those who prioritize a smoother and more refined driving experience, as well as higher horsepower and acceleration. Ultimately, the choice between diesel and gasoline engines in the BMW E90 depends on the driver's specific needs and preferences. **

The decision between a gasoline or diesel engine for the BMW E90 320d depends on your driving habits and priorities. If you prioritize fuel efficiency and torque for long-distance driving, the diesel engine may be a better choice. However, if you prioritize a smoother and quieter driving experience, the gasoline engine may be more suitable. Consider factors such as your typical driving distances, fuel prices in your area, and your personal preferences before making a decision. **

It ultimately depends on your driving habits and preferences. A diesel engine like the one in the BMW E90 320d typically offers better fuel efficiency and torque, making it a good choice for long-distance driving or highway cruising. However, diesel engines tend to have higher upfront costs and require more maintenance. If you primarily drive short distances or in urban areas, a petrol engine may be a better option due to lower emissions and potentially lower maintenance costs. **

The N54 engine is generally considered to be more robust than the N55 in the 335i E90/E92. The N54 has a reputation for being more tunable and capable of handling higher power levels without major modifications. It also has a stronger aftermarket support for performance upgrades. However, both engines have their own strengths and weaknesses, and the N55 may be more reliable in terms of long-term durability and maintenance costs. Ultimately, the choice between the two engines depends on the owner's priorities and intended use for the vehicle. **

The BMW E90 320i is equipped with the N46 engine. This engine is a 2.0-liter inline-four petrol engine that was produced from 2007 to 2011. It was used in various BMW models, including the E90 320i. The N43 engine, on the other hand, is a different 2.0-liter inline-four petrol engine that was used in some other BMW models, but not in the E90 320i. **