Market Segment:
Executive sedan, luxury sport sedan
Key Selling Points:
Driving dynamics, build quality, performance, luxury features, reputation for longevity.
Primary Competitors:
Mercedes-Benz W124 E-Class, Audi 100/200, Jaguar XJ, Volvo 740/760.
Vehicle Philosophy:
'The Ultimate Driving Machine' – emphasis on performance, handling, and driver engagement.
Design Era:
Modern classic design, characterized by clean lines and functional aesthetics.
Engine Mechanical:
Engine overhaul, cylinder head, valve train, crankshaft, pistons, connecting rods, lubrication system, cooling system, engine assembly/disassembly.
Fuel System:
Fuel injection system (Bosch L-Jetronic/Motronic), fuel pump, injectors, fuel lines, fuel pressure regulator, fuel tank.
Ignition System:
Ignition coil, distributor, spark plugs, ignition timing, electronic ignition control.
Transmission:
Manual gearbox (Getrag 260) and automatic gearbox (ZF 4HP22) repair, removal/installation, fluid specifications, and troubleshooting.
Drivetrain:
Clutch, driveshaft, universal joints, differential, rear axle assembly, wheel bearings.
Suspension:
Front and rear suspension components, shock absorbers, springs, control arms, bushings, steering knuckles, wheel alignment specifications.
Steering:
Power steering system, steering rack, steering column, steering linkage, hydraulic pump and hoses.
Brakes:
Front and rear disc brakes, brake calipers, master cylinder, brake lines, brake fluid specifications, ABS (if equipped), parking brake.
Electrical System:
Battery, charging system (alternator, regulator), starting system (starter motor), lighting systems, dashboard instrumentation, wiring diagrams, fuses, relays.
Body And Chassis:
Body panel removal/installation, doors, hood, trunk lid, bumpers, glass replacement, rust repair, chassis lubrication.
HVAC:
Heating, ventilation, and air conditioning (HVAC) system components, refrigerant types, service procedures.
Interior:
Seat removal/installation, interior trim, dashboard removal, headliner.
Routine Maintenance:
Oil changes, filter replacements, fluid checks and top-offs, spark plug replacement, belt inspections.
Troubleshooting:
Diagnostic charts, common problems and solutions, symptom-based troubleshooting for various systems.
Repair And Overhaul:
Detailed step-by-step instructions for component repair, rebuilding, and replacement.
Diagnostics:
Basic diagnostic procedures for electrical and mechanical issues, including checking system pressures and resistances.
Installation Replacement:
Procedures for installing new or reconditioned parts and components.
Depth Level:
Comprehensive, covering routine maintenance to major component overhauls and troubleshooting.
Detail Level:
Detailed technical procedures, torque specifications, clearances, and diagnostic data.
Engine Type:
Inline-6 Cylinder, Naturally Aspirated
Displacement:
2.5 Liters (2498 cc)
Bore X Stroke:
84.0 mm x 75.0 mm
Compression Ratio:
8.8:1 (typical)
Horsepower:
170 hp @ 5800 rpm (approximate, depending on market and specific tuning)
Torque:
210 Nm (155 lb-ft) @ 4000 rpm (approximate)
Fuel Delivery:
Bosch L-Jetronic or Motronic fuel injection
Fuel Type:
Unleaded Gasoline (Premium Octane Recommended)
Engine Layout:
Front-engine, Rear-wheel drive
Valve Train:
SOHC (Single Overhead Camshaft), 2 valves per cylinder
Oil Change Interval:
Typically every 5,000-7,500 miles (8,000-12,000 km) or 6-12 months, depending on driving conditions.
Coolant Flush Interval:
Every 2 years or 30,000 miles (48,000 km).
Timing Belt Or Chain:
The M30 engine utilizes a timing chain, which is designed to last the life of the engine but may require tensioner replacement.
Engine Oil:
API SG or SH, SAE 20W-50 or 15W-40 (check manual for specific recommendations based on climate).
Coolant:
BMW Blue Antifreeze/Coolant (G48) or equivalent, mixed 50/50 with distilled water.
Brake Fluid:
DOT 3 or DOT 4 brake fluid.
Transmission Fluid Manual:
API GL-4 SAE 75W-90 synthetic gear oil.
Transmission Fluid Automatic:
Dexron III or equivalent ATF (Automatic Transmission Fluid).
Common Wear Items:
Control arm bushings, sway bar links, fuel injectors (clogging), coolant hoses, accumulator sphere (hydropneumatic suspension, if equipped on specific models).
Engine Specific Concerns:
Oil leaks from the front or rear main seals, valve cover gasket leaks, potential head gasket issues if overheated.
Electrical Gremlins:
Aging wiring harnesses, corroded grounds, and failing relays can cause intermittent electrical issues.
