Market Segment:
Premium compact executive sports sedan/coupe
Key Competitors 1987:
Mercedes-Benz 190E, Audi 80/90, Alfa Romeo 75, Acura Integra
Driving Dynamics:
Renowned for its balanced handling, rear-wheel-drive dynamics, and driver-focused cockpit.
Engine Reputation:
The M20 straight-six engine is a hallmark of BMW's smooth power delivery and reliability.
Build Quality:
Exceptional build quality and robust engineering characteristic of BMW's E30 platform.
Target Audience:
BMW enthusiasts, owners seeking to maintain or restore their E30 325i/325is, DIY mechanics, independent repair shops.
Coverage Scope:
Comprehensive service, repair, maintenance, and restoration
Estimated Page Count:
1000+
Manual Type:
Full Service and Repair Manual
Format:
Print / Digital (PDF) - depending on specific product offering
Powertrain:
Engine overhaul, fuel injection (Bosch Motronic), cooling system, exhaust system, engine management
Transmission:
Manual and Automatic transmission repair, clutch service, driveline components (driveshaft, differential)
Suspension Steering:
Front and rear suspension components (struts, control arms, bushings), steering rack, power steering system
Brakes:
Front and rear brake system (discs, calipers, master cylinder), ABS system troubleshooting (if equipped), parking brake
Electrical Lighting:
Complete wiring diagrams, alternator, starter, battery, lighting systems, fuses, relays, instrument cluster, ignition system
Body Chassis:
Body panel removal and installation, interior trim, door mechanisms, glass replacement, chassis lubrication
Climate Control:
Air conditioning system (R12), heating system, ventilation
Maintenance:
Routine maintenance (oil changes, filter replacements, fluid checks), tune-ups, scheduled servicing
Troubleshooting:
Systematic diagnostic procedures for common and complex issues, fault code interpretation (where applicable)
Repair Rebuild:
Detailed step-by-step instructions for component removal, repair, and reinstallation, including engine and transmission rebuilds
Restoration:
Guidance for refurbishing and restoring original components, specifications for plating and finishes
Depth:
Extremely detailed, covering all aspects from basic adjustments to complete engine and transmission overhauls.
Diagnostic Capabilities:
Provides specific diagnostic procedures, likely including troubleshooting trees and component testing methods.
Torque Specifications:
Includes comprehensive torque specifications for all fasteners and critical components.
Wiring Diagrams:
Full-color, detailed wiring diagrams for all vehicle systems.
Transmission Type Standard:
Getrag 260 5-speed manual
Transmission Type Optional:
ZF 4HP22 4-speed automatic
Clutch Type:
Hydraulic single-plate dry clutch
Differential:
Standard open differential; limited-slip differential (LSD) often an option
NHTSA Crash Test Ratings:
N/A (Testing standards and availability differ significantly from modern vehicles)
ABS:
Anti-lock Braking System (ABS) available on some models/options
Seatbelts:
3-point front and rear seat belts
Head Restraints:
Adjustable front head restraints
Structure:
Reinforced safety cell, crumple zones (early implementation)
Audio System:
Optional premium sound systems, typically with cassette tape player.
ABS:
As mentioned, ABS was an optional system, not standard across all models.
Early Features:
Focus on core driving experience rather than advanced electronics. Limited connectivity by modern standards.
Oil Change Interval Miles:
Approximately every 5,000 - 7,500 miles or 6-12 months
Spark Plug Replacement Miles:
Typically around 30,000 miles, depending on plug type
Timing Belt Replacement Miles:
Crucial: M20 engines use a timing belt. Replacement interval typically 30,000-40,000 miles or 5 years. Belt failure can cause catastrophic engine damage.
Engine Oil Type:
API SG/SH or higher, SAE 15W-40 or 20W-50 (check manual for specific ambient temperature recommendations)
Coolant Type:
BMW Blue or compatible ethylene glycol-based coolant, mixed 50/50 with distilled water
Brake Fluid Type:
DOT 3 or DOT 4
Transmission Fluid Manual:
GL-4 gear oil (e.g., 75W-90)
Transmission Fluid Automatic:
Dexron III (or equivalent ATF, check manual for specific part number)
Common Wear Items:
Control arm bushings, sway bar links, fuel injectors, fuel pump, coolant hoses, heater core, window regulators, odometer gears (plastic).
Engine Specific Concerns:
Head gasket leaks (especially if overheated), oil pan seal leaks, front crank seal leaks.
Electrical Common Faults:
Fuse box corrosion, chaffed wiring harnesses, failing vacuum lines affecting engine performance.
Brand Legacy:
BMW's reputation for building driver-focused, sporty, and well-engineered vehicles.
E30 Platform Introduction:
The E30 platform debuted in 1982, replacing the E21. The 325i/325is models were introduced later in the E30's lifecycle.
325I Introduction:
The 325i model, powered by the 2.5L M20 engine, arrived in North America for the 1987 model year, succeeding the 325e.
325Is Distinction:
The 'is' designation typically referred to the sportier coupe variant, often with aerodynamic enhancements and a firmer suspension.
E30 Production Years:
1982-1991 (globally)
1987 Model Year Focus:
Represents a key iteration of the E30's performance evolution.
