Engine Mechanical:
Engine assembly, cylinder head, pistons, crankshaft, camshaft, timing, lubrication system, cooling system, fuel delivery, exhaust system
Engine Management:
Engine Control Unit (ECU), ignition system, fuel injection (Bosch Motronic), sensors, actuators, diagnostics, emissions control
Transmission Manual:
Clutch, gearbox, driveshafts, selector mechanism, fluid specifications
Transmission Automatic:
Automatic transmission assembly (e.g., ZF 4HP22), torque converter, hydraulic control, electronic control, fluid specifications
Suspension Front:
MacPherson struts, control arms, anti-roll bar, steering linkage, bushings, shock absorbers
Suspension Rear:
Independent multi-link suspension, control arms, trailing arms, shock absorbers, springs, bushings
Brakes:
Front and rear disc brakes, ABS system (Bosch ABS II), brake calipers, rotors, master cylinder, brake lines, fluid specifications
Steering:
Power steering system, steering rack, steering column, tie rods, fluid specifications
Electrical System:
Battery, alternator, starter motor, lighting system, wiring diagrams, fuses, relays, ECUs, instrument cluster, power windows, central locking
Climate Control:
Heating, ventilation, air conditioning (HVAC) system, refrigerant, compressor, blower motor, controls
Body And Chassis:
Body panels, doors, hood, trunk, glass, interior trim, structural components, rust prevention
Fuel System:
Fuel tank, fuel pump, fuel injectors, fuel filter, fuel pressure regulator
Exhaust System:
Exhaust manifolds, catalytic converter, muffler, exhaust pipes
Routine Maintenance:
Oil changes, filter replacements, fluid checks and top-offs, spark plug replacement, belt inspection and replacement
Engine Repair:
Engine overhaul, gasket replacement, piston ring installation, valve guide replacement, bearing replacement
Transmission Repair:
Clutch replacement, transmission disassembly and reassembly, torque converter replacement, valve body service
Brake System Overhaul:
Brake pad and rotor replacement, caliper rebuilding, master cylinder replacement, brake bleeding, ABS diagnostics and repair
Suspension And Steering Service:
Component replacement (shocks, struts, control arms, tie rods), wheel alignment specifications, power steering system repair
Electrical Diagnostics:
Troubleshooting electrical faults, component testing, wiring harness repair, diagnostic trouble code (DTC) interpretation
HVAC Service:
Refrigerant recharge, leak detection, component replacement (compressor, evaporator, condenser), blower motor service
Bodywork And Trim:
Panel removal and installation, glass replacement, interior trim fitting, seal replacement
Troubleshooting:
Step-by-step diagnostic procedures for common and uncommon issues
Technical Specifications:
Torque values, clearances, fluid capacities, electrical resistance values
Wiring Diagrams:
Detailed, system-specific wiring schematics for electrical components and systems
Depth Level:
Comprehensive (from basic maintenance to complete engine and transmission rebuilds)
Diagnostic Capability:
Advanced diagnostic procedures, including information on fault codes and sensor readings
Special Tools:
Identification and usage of specialized tools required for certain procedures
Oil Change:
Every 7,500 - 10,000 miles or 12 months (depending on driving conditions and oil type used, consult manual for specific recommendations)
Spark Plugs:
Inspect every 30,000 miles, replace every 60,000 miles (use recommended OEM plugs)
Coolant Flush:
Every 2-3 years or 30,000 miles
Transmission Fluid Automatic:
Typically 'lifetime' fill, but proactive replacement every 60,000-100,000 miles is recommended for longevity.
Transmission Fluid Manual:
Every 50,000-60,000 miles
Power Steering Fluid:
BMW Power Steering Fluid (or ATF Dexron III)
Engine Oil Leaks:
Valve cover gasket, oil pan gasket, oil filter housing gasket
Cooling System:
Plastic coolant expansion tank can become brittle and crack, water pump failure
Suspension:
Worn control arm bushings, worn rear trailing arm bushings, sagging front springs
Electrical:
ABS sensor failures, headlight leveling system issues, door lock actuators, OBC (On-Board Computer) pixelation
Fuel System:
Fuel pump failure, clogged fuel injectors
Maintenance Schedule Detail
Major Service Points:
Timing belt (if applicable to specific variants, M30 is chain-driven), coolant, brake fluid, transmission fluid, differential fluid, spark plugs, air filter, fuel filter.