Market Segment:
Premium compact executive car segment
Key Competitors:
Audi A4, Mercedes-Benz C-Class, Lexus IS, Infiniti G35/G37
Driving Dynamics:
Renowned for balanced chassis, precise steering, and engaging driving experience characteristic of BMW's 'Ultimate Driving Machine' slogan.
Engine Technology:
Features BMW's advanced N52 naturally aspirated inline-six engine, praised for its smooth power delivery, efficiency, and innovation (e.g., Valvetronic throttle-less intake technology).
All Wheel Drive:
Availability of the xDrive all-wheel-drive system on 325xi and 328xi models, enhancing traction and stability in various driving conditions.
Covered Systems:
Engine Mechanical, Engine Management, Fuel System, Cooling System, Exhaust System, Drivetrain (Manual & Automatic Transmissions), All-Wheel Drive (xi models), Suspension, Steering, Brakes (ABS, DSC), Body Electrical, HVAC, Chassis, Wiring Diagrams, Diagnostics, Troubleshooting, Lubrication, Maintenance, Routine Service
Estimated Page Count:
1500+
Manual Type:
Factory Service Manual / Workshop Manual
Format:
Digital Download (PDF)
Engine Systems:
Detailed disassembly, assembly, inspection, and repair procedures for the N52 inline-six engine (2.5L and 3.0L variants), including VANOS, Valvetronic, ignition system, fuel injection, cooling, lubrication, and emission controls. Specific coverage for dual VANOS (Variable Valve Timing).
Drivetrain Systems:
Complete service and repair information for both manual (e.g., Getrag GS6-37BZ) and automatic transmissions (e.g., ZF 6HP19/6HP26). Includes torque converter, clutch replacement, transmission fluid and filter service, and component-level repairs. Specific coverage for xDrive all-wheel-drive system (transfer case, differentials, drivelines).
Brake And Suspension Systems:
Detailed procedures for brake system components (pads, rotors, calipers, ABS modulator, DSC sensor calibration), suspension (struts, shocks, control arms, bushings, subframes), and steering systems (power steering pump, rack and pinion, tie rods). Includes wheel alignment specifications.
Electrical And Body Systems:
Comprehensive wiring diagrams for all vehicle systems, fuse box locations, relay assignments, diagnostic connector pinouts. Covers body control module (BCM), lighting systems (headlights, taillights, interior), power windows, locks, mirrors, and comfort features. Includes diagnostic trouble codes (DTCs) and troubleshooting flowcharts.
Maintenance Procedures:
Scheduled maintenance items such as oil changes, filter replacements (oil, air, cabin), spark plug replacement, brake fluid flush, coolant flush, drive belt replacement, and drivetrain fluid changes. Includes specific torque specifications for critical fasteners.
Diagnostic Procedures:
Step-by-step diagnostic strategies for identifying and resolving common and complex issues, including symptom-based troubleshooting guides. Coverage of diagnostic tools and software (e.g., ISTA/D, DIS).
Repair And Rebuild Procedures:
Detailed instructions for component removal, disassembly, inspection, repair, reassembly, and installation for virtually all major and minor systems of the vehicle, from engine internals to body panel replacement.
Depth Of Coverage:
Factory-level technical detail, encompassing routine maintenance, component replacement, complex diagnostics, and full system overhauls. Suitable for professional technicians and advanced DIY mechanics.
Engine Type 325:
3.0L (2996 cc) DOHC 24-valve Inline-6, Naturally Aspirated (N52B30)
Bore X Stroke 325:
85.0 mm x 88.0 mm
Compression Ratio 325:
10.7:1
Engine Type 328:
3.0L (2996 cc) DOHC 24-valve Inline-6, Naturally Aspirated (N52B30)
Bore X Stroke 328:
85.0 mm x 88.0 mm
Compression Ratio 328:
10.7:1
Horsepower 325:
215 hp @ 6100 rpm
Torque 325:
185 lb-ft @ 2500-4000 rpm
Horsepower 328:
230 hp @ 6500 rpm
Torque 328:
200 lb-ft @ 2750-4250 rpm
Fuel Delivery:
Electronic Fuel Injection (EFI), Sequential Multi-port Injection (MPI) with Valvetronic intake system
Fuel Type:
Premium Unleaded (91 octane recommended)
ECU Type:
Bosch Motronic (e.g., ME9.2)
Transmission Type Std:
6-speed Manual
Transmission Type Opt:
6-speed Automatic (Steptronic with paddle shifters)
Transmission Features:
Adaptive transmission control, manual shifting mode (Steptronic), rear-wheel drive (RWD) or xDrive all-wheel drive (AWD)
Automatic Transmission Fluid:
BMW ATF JWS 3309 or Pentosin ATF1 (refer to manual for exact spec based on transmission code)
Manual Transmission Fluid:
BMW MTF LT-3 or equivalent (e.g., Pentosin MTF2)
Transfer Case Fluid Xi:
BMW X-drive Transfer Case Fluid (e.g., ATF Dextron III compatible or specific BMW fluid)
NHTSA Front Impact:
5-Star (Driver and Passenger)
IIHS Top Safety Pick:
Yes
Dynamic Stability Control:
Standard (DSC)
Traction Control:
Standard (ASC+T or DTC)
Anti Lock Brakes:
Standard (ABS)
Electronic Brake Force Distribution:
Standard (EBD)
Airbags:
Frontal airbags, front side-impact airbags, front and rear head protection system (curtain airbags)
Seatbelts:
Active front head restraints, pre-tensioners and force limiters
Idrive System:
Introduction of the iDrive infotainment system, with options for navigation, Bluetooth, and advanced audio controls accessed via a central controller and display.
Audio Options:
Standard BMW Professional Radio, optional Logic 7 premium audio system
Parking Assistance:
Optional rear parking sensors (Park Distance Control - PDC)
Cruise Control:
Standard cruise control, optional Active Cruise Control (ACC) on some models.
Bluetooth:
Optional Bluetooth hands-free interface with voice control
Usb Aux:
Optional USB/Audio interface for music playback and charging
Oil Change Interval:
Variable, based on Condition Based Service (CBS) system (typically 10,000-15,000 miles or 12-24 months)
Spark Plug Replacement Interval:
Approx. 60,000 miles (refer to manual for specific N52 engine recommendations)
Brake Fluid Flush Interval:
Every 2 years (regardless of mileage)
Coolant Flush Interval:
Initial fill is long-life; replacement interval varies (e.g., 4-5 years or 60,000 miles, consult manual)
Engine Oil Specification:
SAE 0W-30 or 5W-30 Synthetic, BMW LL-01 approved (e.g., Castrol EDGE Professional BMW LL01)
Engine Oil Capacity:
Approx. 6.5 quarts (6.2 liters) for 325i/328i
Coolant Specification:
BMW Blue Coolant (G48) or equivalent, mixed 50/50 with distilled water
Common Issues N52 Engine:
Valve cover gasket leaks (oil seepage), eccentric shaft sensor failure, VANOS solenoid issues, PCV (Positive Crankcase Ventilation) system issues (especially the valve/hose), ignition coil failures, water pump failure (often plastic impeller).
Common Issues E90:
Power steering hose leaks, fuel pump failures, ABS/DSC sensor failures, HVAC blower motor resistor failure, active steering pump failure (if equipped), rear subframe bushings wear.
Bmw Heritage:
BMW AG, a German multinational company that produces luxury vehicles and motorcycles, founded in 1916, known for performance and engineering excellence.
E90 Generation Introduction:
The E90 generation replaced the E46 3 Series and introduced significant advancements in technology, chassis design, and powertrain efficiency. The 325i and 328i models represented the core of the sedan and wagon lineup, with the 'xi' variants offering xDrive AWD.
Production Locations:
Primarily Germany (Dingolfing, Munich), also Mexico and South Africa for certain markets.
Car And Driver 10Best:
Consistently recognized by Car and Driver as a 10Best winner during its production years for its driving dynamics and overall quality.
Ward S 10Best Engines:
The N52 engine was recognized by Ward's AutoWorld as one of the 10Best Engines multiple times.
Consumer Reports Ratings:
Generally good to excellent predicted reliability ratings, though some specific components have been noted for issues (refer to known issues section).
