Positioning:
The BMW 325i (E30) was positioned as a sporty, premium compact executive car, celebrated for its engaging driving dynamics and quality engineering.
Competitors:
Competed with vehicles like the Mercedes-Benz 190E, Audi 80/90, and Alfa Romeo 75. Known for superior handling and driver involvement compared to many rivals.
Driving Dynamics:
Renowned for its balanced chassis, rear-wheel drive, and communicative steering, offering an exceptional driving experience.
Engine Performance:
The M20B25 engine provided a smooth power delivery and a characteristic inline-six sound, offering a good blend of performance and refinement.
Build Quality:
Exemplified BMW's reputation for solid construction and durable components, contributing to its longevity.
Engine:
M20 inline-six (2.5L), including lubrication, cooling, fuel injection (Bosch Motronic), ignition, exhaust, and emission controls.
Transmission:
Getrag 260 5-speed manual and ZF 4HP22 4-speed automatic transmissions, including operation, maintenance, and repair.
Drivetrain:
Clutch system, driveshaft, differential, and rear axle assembly.
Suspension:
Front McPherson struts, rear semi-trailing arm independent suspension, shocks, springs, bushings, and alignment specifications.
Brakes:
Front vented discs, rear solid discs, hydraulic system, ABS (Antilock Braking System) operation and components, parking brake.
Steering:
Power-assisted recirculating ball steering system, steering rack, pump, and associated components.
Electrical System:
12V system, battery, alternator, starter, fuse box, wiring diagrams, lighting, instrument cluster, and power accessories.
Fuel System:
Fuel tank, fuel pump, fuel lines, fuel injectors, fuel pressure regulator, and diagnosis of fuel delivery issues.
Cooling System:
Radiator, fan (mechanical or electric), water pump, thermostat, hoses, and coolant specifications.
Exhaust System:
Exhaust manifolds, catalytic converter, mufflers, pipes, and hangers.
Body And Chassis:
Body panels, doors, hood, trunk, interior trim, and chassis structure.
Maintenance:
Scheduled maintenance, oil changes, filter replacements, spark plug replacement, belt inspection and replacement, fluid checks and changes.
Troubleshooting:
Diagnostic procedures for common issues, fault code interpretation (if applicable for the era), symptom-based troubleshooting.
Repair:
Step-by-step repair instructions for major components: engine rebuilds, transmission overhauls, brake system repairs, suspension component replacement, electrical system repairs.
Diagnostics:
Engine performance diagnostics, electrical system testing, fuel system pressure testing, emissions system testing.
Removal Installation:
Detailed procedures for removing and installing major assemblies and components.
Specifications Data:
Torque specifications, clearances, alignments, fluid capacities, electrical specifications.
Depth:
Comprehensive, from basic routine maintenance to complete engine and transmission overhauls, covering all aspects required for professional repair and servicing.
Type:
Getrag 260 5-speed manual transmission
Type:
ZF 4HP22 4-speed automatic transmission
Manual Gear Ratios:
1st: 3.72, 2nd: 2.11, 3rd: 1.31, 4th: 1.00, 5th: 0.81, Reverse: 3.40
Automatic Gear Ratios:
1st: 2.48, 2nd: 1.48, 3rd: 1.00, 4th: 0.72, Reverse: 2.09
Clutch Type:
Single dry plate, hydraulic actuation (manual transmission)
Manual Transmission Fluid:
BMW ATF Dexron III (or equivalent)
Automatic Transmission Fluid:
BMW ATF Dexron III (or equivalent)
NHTSA Frontal Impact:
N/A (Crash testing standards evolved significantly)
ABS:
Standard Bosch ABS II (Antilock Braking System) on all wheels.
Traction Control:
Optional ASC+T (Automatic Stability Control + Traction) on some later models, but not standard on the 1989 325i.
Airbags:
Driver's side airbag optional, passenger airbag not available.
Seatbelts:
3-point inertia-reel seatbelts front, 2-point lap belts rear.
Rollover Protection:
Reinforced A-pillars and body structure.
Oil Change Interval:
Every 7,500-10,000 miles or annually, whichever comes first. Consult manual for specific conditions.
Spark Plug Replacement:
Recommended every 30,000 miles (check manual for exact type and gap).
Timing Belt Replacement:
M20 engines use a timing belt. Recommended replacement every 50,000-60,000 miles or 5 years. Belt failure is catastrophic.
Engine Oil Type:
BMW High Performance Synthetic 5W-30 or 5W-40 (API SJ/SL or ACEA A3/B3) – consult manual for precise viscosity and approvals.
Engine Oil Capacity:
5.7 Liters (6.0 US Quarts) with filter change.
Coolant Type:
BMW Blue Antifreeze/Coolant (G48) or equivalent ethylene glycol-based coolant with corrosion inhibitors.
Coolant Capacity:
Approx. 8.0 Liters (8.5 US Quarts)
Brake Fluid Type:
DOT 4 brake fluid
Common Problems:
Cooling system leaks (radiator, hoses, water pump), fuel distributor issues, AFM sensor problems, electrical connector corrosion, differential mount failure, strut mount wear, heater control valve leaks.
Rust Prone Areas:
Wheel arches, rocker panels, jacking points, sunroof drain channels, trunk floor.
Heritage:
BMW's reputation for building driver-focused, performance-oriented vehicles with a focus on engineering excellence and sporting heritage.
E30 Generation:
The E30 generation (1982-1994) is a highly revered chassis, marking a significant step for BMW's 3 Series, moving from the squared-off E21 to a more aerodynamic and refined design. The 325i was a cornerstone of this generation.
Production Years:
E30 325i production: 1986-1992 (globally, specific model year 1989 is covered).
Manufacturing Locations:
Primarily Germany, with some assembly in South Africa and other locations.
Notable Variants:
Includes the M3 (E30), convertible, touring (wagon), and various performance packages.
