Engine Mechanical:
Engine assembly, cylinder head, block, crankshaft, pistons, connecting rods, timing components, valve train, lubrication system, cooling system.
Engine Management:
Fuel injection system (Bosch Motronic), ignition system, electronic control unit (ECU) diagnosis, emissions control systems, sensor testing.
Transmission Manual:
Clutch, gearbox overhaul, gear shifting mechanisms, driveshafts, final drive unit.
Suspension:
Front suspension (MacPherson struts), rear suspension (semi-trailing arms), shock absorbers, springs, bushings, wheel alignment specifications.
Brakes:
Brake system components (master cylinder, calipers, rotors, pads), hydraulic lines, parking brake system, ABS (Anti-lock Braking System) diagnostics and components.
Steering:
Steering system components, power steering system, steering column, steering linkage, rack and pinion assembly.
Electrical System:
Battery, charging system (alternator), starting system (starter motor), lighting system, horns, wipers, washers, power windows, central locking.
Body And Interior:
Body panel removal and installation, door mechanisms, interior trim, seats, dashboard, HVAC (Heating, Ventilation, and Air Conditioning) system.
Chassis And Frame:
Frame construction, body mounts, structural components.
Transmission Auto Coverage:
Automatic transmission (if applicable) operation, fluid service, basic troubleshooting, component identification.
Preventative Maintenance:
Routine inspection, fluid changes (oil, coolant, brake fluid), filter replacements (oil, air, fuel), spark plug replacement, belt inspection and replacement.
Engine Repair:
Engine tuning, compression testing, gasket replacement (head gasket, intake manifold gasket), oil seal replacement, piston ring replacement, bearing service.
Fuel System Service:
Fuel pump testing, injector diagnosis and cleaning, fuel filter replacement, fuel line repair.
Cooling System Service:
Coolant flush and refill, thermostat replacement, water pump replacement, radiator service, heater core diagnosis.
Transmission Service:
Clutch adjustment and replacement, transmission fluid and filter change, internal transmission component repair.
Brake System Repair:
Brake pad and rotor replacement, caliper overhaul, brake line bleeding, ABS component replacement and testing.
Suspension And Steering Repair:
Shock absorber and strut replacement, control arm bushing replacement, tie rod end replacement, power steering pump and rack repair.
Electrical Diagnostics:
Wiring diagrams, circuit testing, component testing (alternator, starter, sensors), fuse and relay diagnosis, troubleshooting electrical faults.
Troubleshooting Guides:
Diagnostic charts and flowcharts for common drivability issues, starting problems, electrical malfunctions, and mechanical failures.
Bodywork Repair:
Panel alignment, minor dent repair, trim piece replacement.
Depth:
Expert-level, covering complete vehicle overhaul, diagnostics, and component-level repair.
Diagnostic Coverage:
In-depth diagnostic procedures for all major systems, including electronic fault code retrieval and interpretation (where applicable via specific diagnostic tools).
Specification Detail:
Precise torque specifications, clearances, fluid capacities, and performance parameters for all components.
Oil Change Interval:
Recommended every 7,500 - 10,000 miles (12,000 - 16,000 km) or annually, whichever comes first, depending on driving conditions.
Coolant Change Interval:
Every 2 years or 30,000 miles (48,000 km).
Brake Fluid Change Interval:
Every 2 years, regardless of mileage.
Spark Plug Replacement Interval:
Every 30,000 miles (48,000 km) for standard plugs, potentially longer for specific types if used.
Engine Oil Type:
API SG/SH or ACEA A2/A3. Viscosity typically SAE 5W-30 or 5W-40, depending on climate. BMW recommended Castrol.
Coolant Type:
BMW blue coolant (G48 ethylene glycol based) mixed 50/50 with distilled water.
Transmission Fluid Manual:
API GL-4 SAE 75W-90 Synthetic Gear Oil
Transmission Fluid Automatic:
ZF TE-ML 04D or equivalent ATF (Dexron III often substituted)
Power Steering Fluid:
ATF (Dexron II or III)
M40 Engine Timing Chain:
The plastic timing chain tensioner guides can become brittle and fail, leading to significant engine damage if not addressed. Regular inspection and replacement are advised.
Cooling System Leaks:
Plastic coolant expansion tanks and pipes can become brittle and crack, causing leaks. Water pumps and thermostats are also common failure points.
Heater Core:
Heater core leaks are a common issue, often leading to coolant smells inside the cabin and fogged windows.
Suspension Bushings:
Rubber suspension bushings (e.g., control arm bushings, trailing arm bushings) can degrade over time, affecting handling and ride quality.
Window Regulators:
Manual and electric window regulators can fail, causing windows to drop or become difficult to operate.
ABS Sensor Failure:
ABS wheel speed sensors can fail, causing the ABS warning light to illuminate and disabling the system.