Engine Mechanical:
Engine assembly, cylinder head, valves, pistons, crankshaft, camshafts, timing, lubrication system, cooling system, fuel delivery.
Engine Management:
Engine Control Unit (ECU) operation, sensors (MAP, MAF, O2, Crankshaft, Camshaft), actuators (injectors, ignition coils), ignition system, fuel injection system (DME).
Transmission:
Manual and Automatic transmission overhaul, clutch, torque converter, gear shifting mechanisms, transmission control unit (TCU).
Drivetrain:
Driveshafts, differentials, axle shafts, wheel bearings, limited-slip differential (if equipped).
Suspension:
Front and rear suspension components, struts, shock absorbers, control arms, bushings, springs, anti-roll bars, alignment specifications.
Brakes:
Brake system diagnostics, hydraulic system, ABS (Anti-lock Braking System) components, brake pads, rotors, calipers, lines, master cylinder, brake fluid specifications.
Steering:
Power steering system, steering rack, tie rods, steering column, power steering fluid specifications.
Electrical System:
Battery, charging system (alternator), starter motor, lighting system, wiring diagrams, fuses, relays, body control module (BCM).
Comfort Systems:
HVAC (Heating, Ventilation, and Air Conditioning) system, climate control, blower motor, refrigerant, dashboard controls.
Body And Interior:
Body panels, doors, windows, locks, interior trim, seats, airbags, safety restraint systems.
Diagnostics And Troubleshooting:
Diagnostic trouble codes (DTCs), fault finding procedures, common problems and solutions.
Routine Maintenance:
Oil changes, filter replacements, spark plug replacement, fluid checks and top-offs, belt inspection and replacement.
Major Repairs:
Engine overhaul, transmission rebuild, suspension component replacement, brake system repair, electrical component troubleshooting and replacement.
Diagnostics:
Step-by-step diagnostic procedures for various systems, using diagnostic tools and interpreting sensor data.
Wiring Diagrams:
Detailed electrical wiring diagrams for all major systems, including component identification and circuit tracing.
Specifications And Tolerances:
Torque specifications for fasteners, clearances, and other critical engineering specifications.
Special Tools:
Identification and usage of specialized tools required for specific repair procedures.
Depth Level:
Professional-level, detailed procedures for mechanics and advanced DIY enthusiasts.
Troubleshooting Approach:
Systematic troubleshooting guides based on symptom, diagnostic codes, and component testing.
Diagnostic Tools:
References to diagnostic equipment and methods used by professional technicians.
Engine Type:
Naturally Aspirated Inline 6-Cylinder
Displacement:
2494 cc (2.5 Liters)
Bore X Stroke:
84.0 mm x 75.0 mm
Compression Ratio:
10.2:1
Valve Train:
DOHC, 4 valves per cylinder, VANOS (Variable Valve Timing)
Horsepower Hp:
168 hp @ 5500 rpm
Torque Lb Ft:
245 Nm (181 lb-ft) @ 3950 rpm
Fuel Delivery:
Multi-point Fuel Injection (Bosch Motronic DME)
Fuel Type:
Premium Unleaded Gasoline (91+ octane)
Oil Capacity Quarts:
6.5 quarts (6.2 liters) with filter change
Recommended Oil Viscosity:
SAE 5W-30 or 5W-40 (BMW Longlife-01 approved)
Coolant Capacity Quarts:
8.1 quarts (7.7 liters)
Coolant Type:
BMW Blue Coolant (G48 ethylene glycol-based)
Transmission Type Standard:
5-Speed Manual (Getrag 260/5 or ZF S5-325)
Transmission Type Optional:
5-Speed Steptronic Automatic (GM A5S 325Z)
Automatic Features:
Steptronic manual shift mode.
Manual Transmission Fluid:
API GL-4 or GL-5, SAE 75W-90 synthetic gear oil (e.g., Castrol Syntrans GL-4 or BMW approved).
Automatic Transmission Fluid:
BMW LT-2, LT-3, or LT-4 specification (e.g., Esso LT 71141).
Oil Change Interval:
Typically every 7,500 - 10,000 miles or 12 months, using BMW Longlife oil.
Air Filter Replacement:
Every 15,000 - 30,000 miles or as needed based on inspection.
Spark Plug Replacement:
Every 60,000 - 100,000 miles for iridium plugs, earlier for platinum or standard copper.
Coolant Flush Interval:
Every 2 years or 30,000 miles.
Brake Fluid Flush:
Every 2 years.
Power Steering Fluid:
ATF Dexron III / Mercon or Pentosin CHF 11S (check specific vehicle build).
Brake Fluid Type:
DOT 3 or DOT 4.
Cooling System Leaks:
Plastic expansion tank, water pump, and hoses are prone to cracking and leaks.
Oil Pan Gasket Leaks:
Common leak point due to age and material degradation.
Vanos Unit:
Solenoid seals and O-rings can degrade, leading to rough idle and loss of low-end torque.
Window Regulators:
Plastic components can fail, causing power windows to stop working.
Oil Filter Housing Gasket:
Can degrade and cause oil leaks.
