Positioning:
A definitive guide for BMW E30 owners seeking to maintain, repair, or restore their vehicles.
Comparison:
This guide offers a more hands-on, enthusiast-driven approach compared to generic workshop manuals, with a focus on restoration challenges.
Author Expertise:
Written by Andrew Everett, a seasoned journalist and dedicated E30 enthusiast, ensuring practical and informed advice.
Model Breadth:
Covers a wide array of E30 variants, including performance models and special editions.
Powertrain:
Engine mechanicals, fuel systems, ignition systems, exhaust systems
Drivetrain:
Transmission (manual and automatic), clutch, driveshafts, differentials
Suspension Steering:
Front and rear suspension components, steering rack, power steering system
Brakes:
Brake system diagnostics, fluid replacement, caliper and disc service, ABS (where applicable)
Electrical:
Wiring diagrams, component testing, battery, alternator, starter, lighting, instrumentation
Bodywork:
Panel replacement, rust repair techniques, trim removal/installation, convertible top mechanisms
Interior:
Seat removal, dashboard repair, interior trim restoration
Routine Maintenance:
Oil changes, filter replacements, spark plug replacement, coolant service, brake fluid service
Troubleshooting:
Diagnostic procedures for common running issues, electrical faults, and mechanical problems
Major Repairs:
Engine rebuilds, transmission overhauls, suspension component replacement, body panel welding
Restoration Tips:
Expert advice on sourcing parts, paint matching, period-correct detailing, and common pitfalls
Depth:
Comprehensive, from basic maintenance to full engine and chassis rebuilds
Audience:
Enthusiasts and DIY mechanics with varying skill levels
Engine Options Covered:
M10 (4-cylinder petrol), M20 (6-cylinder petrol), M21 (4-cylinder diesel), S14 (4-cylinder performance petrol for M3)
Example Performance 325I:
Approx. 170-171 hp (DIN) / 125-126 kW, 211 Nm torque (M20B25)
Example Performance M3:
Approx. 192-215 hp (DIN) / 141-158 kW, 240-255 Nm torque (S14B23/B25)
Example Performance 324Td:
Approx. 86 hp (DIN) / 63 kW, 170 Nm torque (M21D24 turbo-diesel)
Fuel Injection:
Bosch L-Jetronic, Motronic (various versions) for petrol engines
Fuel Type:
Unleaded Petrol (Octane ratings vary by engine), Diesel
316:
1.8L M10B18 (carbureted)
316I:
1.8L M10B18 (fuel injected)
318I:
1.8L M10B18 (fuel injected)
320I:
2.0L M20B20 (fuel injected)
323I:
2.3L M20B23 (fuel injected)
325I / 325E:
2.7L M20B27 ('Eta' for 325e) or 2.5L M20B25 ('standard' for 325i) (fuel injected)
324D / 324Td:
2.4L M21D24 (naturally aspirated diesel / turbocharged diesel)
318Is:
1.8L M42B18 (16v DOHC, fuel injected)
M3:
2.3L S14B23 (16v DOHC, fuel injected)
Alpina:
Various M20-based engines, often with increased displacement (e.g., 2.7L, 2.9L) and tuning
Wheelbase:
Approx. 2570 mm (91.3 in)
Length:
Approx. 4340 mm (170.9 in) for saloon
Width:
Approx. 1675 mm (65.9 in) for saloon
Height:
Approx. 1380 mm (54.3 in) for saloon
Curb Weight Approx:
1150-1350 kg (2535-2976 lbs) depending on model and equipment
Gross Vehicle Weight:
Varies by model, typically around 1700-1850 kg
Crash Test History:
Early models pre-date modern standardized crash testing, but were designed with safety cage principles. Later models saw improvements.
Braking System:
Front ventilated discs, rear solid discs. ABS optional or standard on higher trims/later models.
Seatbelts:
Three-point inertia-reel seatbelts standard, rear lap belts in some early models.
Body Structure:
Reinforced A-pillars, B-pillars, and side impact protection beams.
Original System:
Period-appropriate Blaupunkt or BMW-branded radios with cassette players. Optional CD players in later years.
Assistance Features:
ABS (Anti-lock Braking System) became increasingly common and eventually standard on many models. Otherwise, driver aids were minimal, focusing on the driving experience.
Connectivity Options:
No modern connectivity features such as Bluetooth, USB, or smartphone integration in original spec. Modern head units often offer these as upgrades.
Oil Change Interval Petrol:
Typically 7,500-10,000 miles (12,000-16,000 km) or 12 months, consult manual for specific engine.
Timing Belt Interval M20:
Approx. 30,000-50,000 miles (50,000-80,000 km) or 3-4 years. Critical for M20 engines.
Spark Plug Replacement:
Varies by plug type, typically 30,000-60,000 miles.
Engine Oil Spec:
API SG/SH, ACEA A2 or similar. Viscosity varies by climate: 10W-40, 15W-40, 5W-40 (synthetic). Consult manual for specific M-engine requirements.
Coolant Spec:
BMW Antifreeze/Coolant concentrate mixed 50/50 with distilled water. (e.g., G48 or similar ethylene glycol based).
Brake Fluid Spec:
DOT 3 or DOT 4, depending on system requirements (especially if ABS equipped).
Transmission Fluid Manual:
API GL-4 or GL-5 gear oil, typically 75W-90 or 80W-90. Check manual for specific Getrag requirements.
Transmission Fluid Auto:
Dexron III or equivalent ATF fluid.
Common Faults:
Cooling system leaks (hose failures, radiator), fuel distributor/pump issues (K-Jetronic), differential mounts cracking, front control arm bushings, wiring harness degradation, rust (wheel arches, rocker panels, battery tray).
M20 Engine Specific:
Timing belt failure due to lack of replacement, oil leaks from rear main seal, eccentric shaft sensor failure (later models).
S14 Engine Specific:
Valve guide wear, potential for oil starvation if not properly maintained.
Brand Focus:
BMW's reputation for 'The Ultimate Driving Machine' built on sporty sedans and coupes.
Generation Introduction:
Launched in 1982 as a successor to the E21, the E30 defined the compact executive segment.
Body Styles:
Available as 2-door sedan, 4-door sedan, convertible (E30 Cabrio), and later the highly sought-after M3 coupe and Touring (wagon, limited production).
Major Updates:
Significant facelift in 1987 (E30-2) with revised bumpers, grille, and interior elements. Introduction of 16-valve engines (318iS, M3).
Production Years:
1982-1991 (E30 chassis)
Production Volume:
Over 2.3 million units produced globally.
Key Markets:
Europe, North America, Japan.
Performance Acclaim:
The E30 M3 was a highly successful touring car homologation special, winning numerous championships worldwide.
Enthusiast Following:
Consistently ranked as a 'modern classic' and highly regarded for its driving dynamics and build quality by automotive publications and enthusiasts.
Bmw Legacy:
Considered by many to be one of BMW's most iconic and well-balanced chassis designs.
