Segment:
Compact Executive Sedan/Coupe
Reputation:
Known for sporty handling, robust engineering, and driver engagement.
Competitors:
Mercedes-Benz 190E, Audi 80/90, Alfa Romeo 75, Volvo 240.
Design:
Iconic Chris Bangle-influenced design, quintessential BMW proportions.
Performance Focus:
Rear-wheel drive platform, balanced chassis, responsive engines.
Build Quality:
Typical BMW build quality, designed for longevity.
Engine:
Complete engine overhaul, diagnostics, fuel injection (Bosch Motronic), ignition system, cooling system, exhaust system, engine mechanicals (cylinder head, block, crankshaft, pistons, connecting rods).
Transmission:
Manual and automatic transmission repair, clutch operation, gearbox components, driveshafts, differential.
Brakes:
Hydraulic system, ABS (where applicable), brake pads, rotors, calipers, master cylinder, brake lines, parking brake.
Electrical:
Complete wiring diagrams, starter motor, alternator, battery, lighting systems, fuses, relays, instrument cluster, power windows, power locks, radio, control modules.
Suspension Steering:
Front and rear suspension components, shock absorbers, struts, springs, bushings, wheel bearings, power steering system, steering rack, tie rod ends.
Body Chassis:
Body panel removal and installation, doors, hood, trunk, bumpers, interior trim, chassis lubrication, rust prevention.
HVAC:
Heating, ventilation, and air conditioning system diagnosis and repair, blower motor, heater core, evaporator, refrigerant.
Maintenance:
Scheduled maintenance, oil changes, filter replacements, spark plug replacement, fluid checks and changes, belt inspection and replacement.
Diagnostics:
Troubleshooting guides for common problems, diagnostic fault codes (where applicable), component testing procedures.
Repair:
Step-by-step repair instructions for all major vehicle systems, including component disassembly, cleaning, inspection, and reassembly.
Adjustment:
Valve adjustments, parking brake adjustment, idle speed adjustment.
Lubrication:
Lubrication points and schedules, grease types, oil specifications.
Specification Settings:
Torque specifications for critical fasteners, engine timing settings, wheel alignment specifications.
Depth:
Comprehensive: Covers everything from routine maintenance and minor repairs to complete engine and transmission overhauls. Includes detailed diagnostic procedures and exploded views.
Engine Code:
M20B27 (often referring to the 2.7L) / M20B25 (2.5L for 325i)
Engine Type:
Inline 6-cylinder, SOHC
Displacement 325I:
2.5 Liters (2494 cc)
Bore X Stroke 325I:
84 mm x 75 mm
Compression Ratio 325I:
8.5:1 or 9.1:1 depending on market/version
Horsepower 325I:
168-170 hp @ 5800-6000 rpm (varies by market and specific engine variant)
Torque 325I:
220-230 Nm (162-169 lb-ft) @ 4300-4800 rpm (varies by market and specific engine variant)
Fuel Delivery:
Bosch Motronic electronic fuel injection (EFI)
Fuel Type:
Unleaded gasoline (RON 91 or higher recommended)
Ignition Type:
Distributorless ignition system (DIS) or distributor-based with electronic control (depending on specific year/market variant).
Body Styles:
2-door coupe, 4-door sedan
Wheelbase:
Approximately 2565 mm (101 inches)
Length:
Approximately 4340 mm (170.9 inches)
Width:
Approximately 1677 mm (66 inches)
Height:
Approximately 1365 mm (53.7 inches)
Curb Weight:
Approximately 1250-1350 kg (2755-2976 lbs), depending on body style and options.
Oil Change:
Every 7,500 - 10,000 miles (12,000 - 16,000 km) or annually.
Spark Plugs:
Every 30,000 miles (48,000 km), typically using copper-core spark plugs (e.g., NGK BPR6ES).
Timing Belt Chain:
The M20 engine uses a timing chain, which is generally considered maintenance-free unless stretched or worn. Replacement would be on an as-needed basis, often diagnosed by noise.
Engine Oil:
API SF or SG, SAE 10W-40 or 15W-40 (check manual for specific viscosity based on ambient temperature). Capacity: Approx. 4.25 Liters (4.5 Quarts) with filter.
Coolant:
BMW Blue Longlife Coolant or equivalent, mixed 50/50 with distilled water. Capacity: Approx. 6.5 Liters (6.9 Quarts).
Transmission Fluid Manual:
API GL-4, SAE 75W-90 gear oil. Capacity: Approx. 1.5 Liters (1.6 Quarts).
Transmission Fluid Automatic:
Dexron II or Dexron III ATF. Capacity: Approx. 3.5 Liters (3.7 Quarts) for torque converter refill.
Brake Fluid:
DOT 3 or DOT 4 hydraulic brake fluid. Capacity: Approx. 1 Liter (1.1 Quarts).
Common Problems:
Cooling system leaks (hose failures, cracked expansion tanks), fuel injector seal leaks, AFM (Air Flow Meter) issues, fuel pump failures, seized heater blowers, differential seal leaks, E30 specific rust areas (rockers, rear wheel arches).
Maintenance Tip:
Proactive replacement of cooling system components (hoses, water pump, thermostat) is highly recommended due to age.
Bmw Legacy:
BMW's reputation for performance, luxury, and engineering excellence.
E30 Introduction:
The E30 generation replaced the E21 and established BMW's dominance in the compact executive segment.
325 Introduction:
The 325 designation and the M20 engine signified a performance upgrade over previous 323i models.
Production Period:
1982-1994 (E30 overall); 1987-1991 for 325/325i models covered by manual.
Manufacturing Locations:
Germany (Dingolfing, Munich)