Model Years Covered:
1983-1991
Engine Codes Covered:
M10 (M10B18, M10B20), M20 (M20B23, M20B25, M20B27), M40 (M40B18), M42 (M42B18), S14 (S14B23, S14B25)
Target Audience:
BMW E30 owners, independent repair shops, classic car enthusiasts
Value Proposition:
Empowers users to perform repairs and maintenance themselves, saving money and ensuring proper vehicle upkeep
Uniqueness:
Covers a wide range of E30 variants and engine options within a single, comprehensive resource
Diagnostic Capabilities:
Includes diagnostic procedures and information for common E30 electrical and mechanical faults
Wiring Diagrams:
Detailed electrical schematics for all major systems
Torque Specifications:
Precise torque values for critical fasteners
Illustrations Diagrams:
Numerous diagrams and illustrations to aid in understanding procedures
Engine Systems:
Engine mechanical, fuel injection, ignition, cooling, lubrication, exhaust, emissions control
Transmission Systems:
Manual and automatic transmission overhaul, clutch, driveshafts, differentials
Suspension Steering:
Front and rear suspension components, steering rack and linkage, power steering
Brake Systems:
Brake system hydraulic and mechanical components, ABS (where applicable), parking brake
Electrical Systems:
Wiring diagrams, starter, alternator, battery, lighting, instruments, interior electronics, ECU diagnosis
Body Chassis:
Body panel removal and installation, chassis lubrication, doors, windows, interior trim, convertible top mechanisms
Maintenance Procedures:
Oil changes, filter replacements, spark plug service, fluid checks and flushes, belt inspections and replacement
Repair Procedures:
Engine rebuilds, transmission overhauls, brake component replacement, suspension work, electrical component diagnosis and repair
Troubleshooting:
Diagnostic procedures for common problems, fault codes, symptom-based troubleshooting guides
Component Removal Installation:
Detailed step-by-step instructions for removing and installing major and minor components
Depth Of Coverage:
Comprehensive, factory-level detail suitable for professional mechanics and advanced DIY enthusiasts
Engine Family 1:
M10 (Inline 4-cylinder)
Engine Family 2:
M20 (Inline 6-cylinder)
Engine Family 3:
M40 (Inline 4-cylinder)
Engine Family 4:
M42 (Inline 4-cylinder, DOHC)
Engine Family 5:
S14 (Inline 4-cylinder, M3 specific)
M10B18 Hp:
Approx. 101-105 hp
M20B25 Hp:
Approx. 168-170 hp
M20B27 Hp:
Approx. 121-124 hp (ETA), 168-170 hp (i)
M42B18 Hp:
Approx. 134-138 hp
S14B23 Hp:
Approx. 192-200 hp (Euro Spec)
Fuel Delivery Type:
Bosch L-Jetronic, Motronic (various versions depending on engine and year)
Fuel Type:
Unleaded gasoline (Octane rating varies by engine)
Standard Transmission Type:
4-speed and 5-speed Getrag manual transmissions
Optional Transmission Type:
ZF 3-speed or 4-speed automatic transmissions
Clutch Type:
Single dry plate, hydraulically operated clutch
Manual Transmission Fluid:
BMW MTF LT-1 or equivalent (e.g., Pentosin, Red Line)
Automatic Transmission Fluid:
Dexron III or equivalent (consult specific year/model)
Body Styles:
2-door sedan, 4-door sedan, convertible, touring (wagon - limited availability)
Wheelbase Mm:
2570 - 2575 mm (depending on specific model)
Curb Weight Kg:
1150 - 1350 kg (depending on body style and engine)
Infotainment Systems:
Basic analog gauges, optional cassette/radio systems. Later models offered digital clock and premium audio upgrades.
Driver Assistance Features:
Limited by modern standards. Primarily focused on the driving dynamics of the vehicle.
Connectivity Features:
None by modern standards. Pre-dates integrated Bluetooth, USB, or smartphone connectivity.
Oil Change Interval:
Typically every 5,000-7,500 miles or 6-12 months, depending on driving conditions and oil type.
Timing Belt Interval:
For M40 and M42 engines: every 40,000-60,000 miles or 4 years. M10 and M20 engines use timing chains.
Coolant Flush:
Every 2-3 years or as per manufacturer recommendation.
Engine Oil Type:
API SG/SH, ACEA A2/A3, viscosity 5W-30, 5W-40, 10W-40, 15W-50 (depending on engine and climate)
Coolant Type:
BMW Blue/Green antifreeze (Glysantin G05 or equivalent) mixed 50/50 with distilled water
Brake Fluid Type:
DOT 3 or DOT 4
Common Issues 1:
Fuel injector seal leaks, vacuum hose deterioration, starter motor failure, coolant leaks (especially from expansion tanks and hoses)
Common Issues 2:
Rust in common areas (wheel arches, rocker panels, sunroof drains), worn suspension bushings, seized Heater Control Valves (HCVs)
Common Issues 3:
E30 M3: Rod bearing failure if not maintained rigorously, VANOS issues (on later models, though E30 M3 predates significant VANOS adoption).
Bmw Philosophy:
Renowned for 'The Ultimate Driving Machine,' emphasizing performance, handling, and driver engagement.
E30 Introduction:
Introduced as the successor to the E21 3 Series, establishing BMW's reputation for sporty sedans and coupes.
E30 Variants:
Iconic models include the 320i, 325i, M3 (E30), and various Alpina derivatives.
Production Period:
1982-1994 (globally, with E30 body style production ending around 1991 in most markets)
Manufacturing Locations:
Germany, South Africa, Thailand, USA (CKD assembly)
Automotive Press Awards:
Consistently praised for its handling, balance, and driver feedback. Considered a benchmark for compact sports sedans and coupes of its era.
Collector Car Status:
Highly regarded as a modern classic, with significant collector interest, particularly for M3 and well-maintained models.
Service Manual Quality:
Factory-type quality, indicating a high level of accuracy and detail.
