The 2007 BMW 328i represents a significant era for the German automaker, featuring the naturally aspirated N51 3.0-liter inline-six engine. This powerplant is renowned for its smooth power delivery and distinctive acoustic character, but like any sophisticated mechanical system, it demands specific maintenance to ensure longevity and performance. Using the correct lubricants and filters is not just a recommendation; it is a necessity for this vehicle to operate as designed, particularly regarding its sensitive oil consumption characteristics and thermal management needs.
Recommended AMSOIL Products
When selecting the proper lubricants for this BMW, you must consider the specific engineering requirements of the N51 engine and its associated systems. The following products are the top choices for maintaining peak performance and extending service intervals.
- AMSOIL 0W-30 MS 100% Synthetic European Motor Oil – This oil is specifically formulated with a precise blend of synthetic base oils and premium additives designed for the unique demands of European gasoline, diesel, and hybrid engines.
- AMSOIL Oil Filter – This filter provides a filtering efficiency of 99 percent at 20 microns, helping to reduce engine wear and offering greater capacity for small, wear-causing contaminants compared to competing filters.
- MANN-FILTERS Oil Filter – A premium alternative offering improvements over original equipment manufacturer-branded filters, ensuring clean lubrication for the 3.0L N51 engine.
- MANN-FILTERS Air Filters – These filters use premium media that offers improvements over OEM-branded units, ensuring the engine breathes clean air for optimal combustion.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – This OAT formulation provides protection up to 150,000 miles or 5 years and is compatible with all other antifreeze and coolant colors.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option that requires mixing with distilled water, offering protection up to 150,000 miles or 5 years in passenger cars.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Ideal for the GA6-L45R transmission, this fluid withstands heavy towing and elevated temperatures while remaining fluid in sub-zero conditions.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A cost-effective solution that still provides protection against wear for the 6-speed automatic transmission.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Provides excellent ABS and traction-control responsiveness with stable viscosity over a wide temperature range.
- AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube – Specifically formulated for the rear limited-slip differential, this fluid controls thermal runaway and contains friction modifiers for limited-slip applications.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Helps seals remain soft to prevent leaks and resists heat for long fluid life in models equipped with power steering.
Ensuring Engine Health and Longevity
The N51 3.0-liter engine in the 2007 BMW 328i is a sophisticated piece of machinery that requires precise lubrication to function correctly. Unlike simpler engines, this unit operates at high temperatures and relies on the quality of its oil to manage internal tolerances. One of the primary reasons proper lubrication is critical for this vehicle is the specific design of its oil system. The engine has a recommended oil capacity of 6.9 quarts when the AMSOIL Oil Filter is replaced. Ensuring the correct viscosity and volume is vital for the oil pump to circulate fluid effectively through the oil galleries and crankshaft bearings.
Many owners of this generation of BMWs are aware that oil consumption can be an issue. The N51 engine, while reliable, is not immune to the common wear patterns associated with high-mileage European vehicles. High-quality synthetic motor oil helps mitigate this problem. The recommended AMSOIL 0W-30 MS is engineered with a European formula that features a precise blend of synthetic base oils and premium additives. This formulation is designed to reduce oil consumption and control blow-by gases, which can lead to carbon buildup. By using a dedicated European formula oil, you address the specific chemical and thermal stresses placed on this engine, offering a level of cleanliness and protection that conventional oils often cannot match.
In addition to the oil itself, the filtration system plays a pivotal role in the engine’s health. The 2007 BMW 328i benefits from the high-efficiency AMSOIL Oil Filter, which captures 99 percent of contaminants as small as 20 microns. This superior filtration helps keep oil-pump suction screens clear and ensures that the oil circulating through the hydraulic variable valve timing system remains free of debris that could cause valve timing errors or sludge accumulation. For those preferring a premium aftermarket alternative, the MANN-FILTERS Oil Filter also offers significant improvements over OEM units, providing robust media to handle the high soot levels and long intervals between changes.
It is also crucial to remember the correct torque specifications during maintenance. The oil drain plug on the 3.0L N51 engine should be torqued to 19 ft/lbs. Always replace the drain plug gasket when performing an oil change to prevent leaks, which can be costly and environmentally harmful. The engine oil should be checked after refilling to ensure the level is correct, avoiding both under-filling and over-filling, which can cause foaming and reduced lubrication efficiency.
Transmission and Drivetrain Lubrication
The drivetrain of the 2007 BMW 328i is equally critical to its performance characteristics. The vehicle utilizes a 6-speed automatic transmission (GA6-L45R) that requires a fluid capable of handling both the smooth shifts expected in daily driving and the robust protection needed during spirited performance driving. The total fill capacity for the transmission is approximately 10 quarts. While standard fluids exist, synthetic transmission fluids offer distinct advantages in terms of thermal stability and shear resistance.
The AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is designed to withstand the rigors of heavy towing, elevated temperatures, and challenging terrain. It remains fluid in sub-zero temperatures, ensuring prompt engagement and smooth operation regardless of the weather. This fluid provides reserve protection during heavy use, which is particularly beneficial for drivers who enjoy the spirited driving dynamics the BMW 3 Series is famous for. For a slightly more budget-friendly option that still offers premium protection, the AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is an excellent choice. It protects against wear and is designed to maintain its performance characteristics over long intervals.
The rear differential on this model often comes with a limited-slip mechanism. The AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube is specifically formulated for this application. Limited-slip differentials require gear lubricants containing friction modifiers to prevent chatter and ensure smooth power delivery to the wheels. This heavy-duty synthetic gear lube controls thermal runaway, protects against rust and corrosion, and helps reduce operating temperatures. Its long oil and seal life make it a superior choice for maintaining the integrity of the differential housing and gears.
Cooling, Braking, and Fluid Maintenance
Maintaining the cooling system is essential for the longevity of the N51 engine. The cooling system capacity varies slightly depending on the transmission type, with the manual transmission requiring 8.7 quarts and the automatic requiring 9 quarts. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant offers a unique poly-organic acid (OAT) formulation that provides protection up to 150,000 miles or 5 years. It is phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free, making it safe for all cooling system metals, gaskets, and hoses. For those who prefer a concentrate that requires mixing with distilled water, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant provides excellent protection against metallic corrosion and erosion.
The braking system also demands high-performance fluids. The 2007 BMW 328i may require specific BMW-approved fluids, but the AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid serves as an excellent substitute. It offers excellent ABS and traction-control responsiveness and provides a stable viscosity over a wide temperature range, ensuring consistent pedal feel and maximum stopping power.
Finally, the power steering system on this vehicle benefits from a dedicated synthetic fluid. The AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid is formulated to reduce friction, help seals remain soft to prevent leaks, and resist heat for long fluid life. It offers strong anti-wear protection and excellent high-temperature performance, contributing to quiet operation and reduced wear on the steering pump and rack.
Vehicle Background
The 2007 BMW 328i is a quintessential example of the E90 generation 3 Series, a model line that continues to be highly regarded by automotive enthusiasts for its blend of handling, luxury, and performance. Produced at the company’s plant in Greifswald, Germany, the 328i is a four-door sedan powered by the N51 engine. This 3.0-liter naturally aspirated inline-six engine produces 230 horsepower and 200 lb-ft of torque, delivering a linear and smooth power curve that BMW drivers have come to expect from their inline-six predecessors. The engine is a direct replacement for the older M54 engine but includes changes to meet stricter emissions standards, including variable valve timing (VANOS) on both intake and exhaust cams.
Owners of the 2007 BMW 328i often cite the car’s balanced chassis and communicative steering as reasons for their loyalty to the brand. The E90 platform offers a more athletic driving experience compared to previous generations, with a tighter suspension setup and a lower center of gravity. The interior is designed around the driver, featuring high-quality materials and a layout that prioritizes ergonomics. The sedan body style provides a practical compromise between the two-door coupe and the larger 5 Series, making it a versatile choice for both daily commuting and weekend drives.
Despite its reliability, the 2007 BMW 328i does have a few known issues that owners and enthusiasts often discuss. One common concern is oil consumption. While the N51 engine is generally robust, some units may consume oil at a higher rate than ideal, often attributed to the design of the piston rings or valve stem seals over time. High-quality synthetic oils, particularly those formulated for European engines, can help mitigate this by providing better sealing properties and cleaner combustion chamber conditions. Another known problem involves the cooling system components, such as the thermostat and water pump. These plastic components can become brittle with age and heat cycling, leading to potential leaks or failure. Using a high-quality, long-lasting antifreeze coolant like AMSOIL Passenger Car & Light Truck Antifreeze & Coolant can help protect the system and extend the life of these components by reducing the frequency of thermal shocks.
Valvetronic issues and VANOS solenoid problems are also noted in some forums. The Valvetronic system, which controls the lift of the intake valves, can sometimes develop electrical or mechanical faults that trigger warning lights. Proper lubrication and keeping the engine clean can help ensure the mechanical parts move freely. Additionally, the high-pressure fuel pump and injectors can suffer from carbon buildup, especially if the fuel used is not optimal. While not a mechanical failure of the engine itself, carbon accumulation can affect performance and fuel economy. This is where the use of fuel additives like the AMSOIL P.i. Performance Improver Gasoline Additive can be beneficial in restoring injector flow and improving combustion efficiency.
Another common point of discussion among BMW owners is the condition of the rear differential, particularly the limited-slip variant. Over time, the synthetic fluid can break down, leading to gear whine or chatter, especially during sharp turns. Regular fluid changes with a high-quality synthetic gear lube specifically designed for limited-slip differentials like AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube can prevent these issues and ensure smooth power delivery. By addressing these specific areas with the right maintenance products, owners can significantly extend the life of their vehicle and maintain its legendary driving dynamics.
Ultimately, the 2007 BMW 328i remains a rewarding car to own and drive. With the correct fluids and filters, the N51 engine can provide years of reliable service. Whether you are a daily commuter or a weekend track enthusiast, ensuring your vehicle is equipped with the best lubricants available is the first step in preserving its value and performance for years to come.