Positioning:
The 1998 BMW 323is represented the core of BMW's acclaimed compact executive sedan and coupe lineup, known for its engaging driving dynamics and quality engineering. This manual targets owners and independent repair facilities seeking detailed, factory-authorized information.
Competitors:
Competed directly with the Mercedes-Benz C-Class, Audi A4, and Lexus IS300. The 323is distinguished itself with a more driver-focused experience and a robust inline-six engine.
Appeal:
Known for its balanced chassis, responsive steering, and the smooth M52 inline-six engine. The 'is' designation specifically denotes the coupe or convertible body styles.
Benefit To Owner:
Empowers owners to perform maintenance and repairs accurately, saving on labor costs and ensuring proper vehicle upkeep. Crucial for diagnosing complex issues.
Powertrain:
Engine (M52B25), Cooling, Fuel System, Exhaust, Ignition, Lubrication, Transmission (Manual & Automatic)
Chassis:
Suspension (Front & Rear), Steering, Brakes (ABS/DSC), Drivetrain (RWD)
Electrical:
12V Electrical System, Lighting, Instrumentation, HVAC Controls, Audio System, Keyless Entry, Immobilizer (EWS)
Body:
Exterior Body Panels, Doors, Windows, Seats, Interior Trim, Convertible Top (if applicable)
Maintenance:
Oil Changes, Filter Replacements, Spark Plugs, Coolant Flush, Brake Fluid Flush, Belt Replacement, Tune-ups
Diagnostics:
Troubleshooting Flowcharts, DTC Reading & Interpretation (OBD-II), Component Testing
Repair:
Engine Component Overhaul, Transmission Repair, Suspension Component Replacement, Brake Caliper Rebuild, Electrical Component Diagnosis & Replacement
Installation:
Component Installation & Removal Procedures (e.g., Alternator, Starter, Water Pump)
Depth:
Comprehensive: Covers basic maintenance to full engine and transmission rebuilds, including detailed electrical schematics and diagnostic procedures.
Engine Configuration:
Inline 6-cylinder, DOHC, 24 valves
Displacement:
2.5 Liters (2494 cc)
Bore X Stroke:
84.0 mm x 75.0 mm
Compression Ratio:
10.2:1
Horsepower:
168 hp @ 5500 rpm (approx.)
Torque:
181 lb-ft @ 3900 rpm (approx.)
Injection Type:
Multi-point Fuel Injection (Bosch Motronic 5.2)
Fuel Type:
Premium Unleaded (91+ Octane Recommended)
Oil Type:
SAE 5W-30 Synthetic (BMW Longlife-98 specification recommended)
Oil Capacity:
6.5 Liters (6.9 US quarts)
Transmission Type:
5-speed Manual (Getrag 260/5)
Transmission Type:
5-speed Automatic (ZF 5HP18)
Manual Clutch:
Hydraulically Actuated
Automatic Features:
Adaptive Transmission Control (ASC + T on some models)
Manual Transmission Fluid:
API GL-4 or GL-5, SAE 75W-90 Synthetic Gear Oil
Automatic Transmission Fluid:
BMW LT-2 or equivalent Dexron III
NHTSA Frontal Impact:
Not specifically rated for 1998 by NHTSA, but E36 chassis generally performed well for its era.
Traction Control:
Optional Automatic Stability Control (ASC) or ASC + Traction (ASC+T)
Braking System:
4-wheel disc brakes with Anti-lock Braking System (ABS)
Airbags:
Driver and front passenger airbags
Seatbelts:
3-point seat belts with pretensioners
Oil Change Interval:
Every 7,500 - 10,000 miles or 12 months, whichever comes first, using synthetic oil.
Coolant Flush:
Every 30,000 miles or 2 years.
Spark Plug Replacement:
Approx. 60,000 miles (depending on plug type)
Brake Fluid:
DOT 4 (BMW High Performance or equivalent)
Power Steering Fluid:
Pentosin CHF 11S or BMW recommended equivalent
Coolant Type:
BMW Blue Antifreeze/Coolant (G48 Ethylene Glycol based) mixed 50/50 with distilled water
Cooling System:
Plastic expansion tank can become brittle and crack. Water pump impeller can degrade. Cooling fan clutch failure is common.
Suspension:
Front control arm bushings (bushings wear out, leading to steering looseness), Rear subframe mounting points can crack.
Electrical:
Heater control valve failure, window regulator failures, OBC (On-Board Computer) pixelation. Immobilizer (EWS) issues can cause no-start conditions.
Engine:
Oil pan gasket leaks, VANOS (Variable Valve Timing) solenoids or seals can fail, leading to rough idle or loss of low-end power.
Bmw Legacy:
BMW has a long-standing reputation for building sporty, driver-oriented vehicles, often referred to as the ultimate driving machine. This ethos is deeply ingrained in the 3 Series.
E36 Generation:
The E36 generation (1992-1999) marked a significant evolution for the 3 Series, with improved chassis dynamics, comfort, and technology compared to its E30 predecessor. The 323is model was introduced in later years of this generation, often featuring a displacement upgrade over earlier 320i models.
Production Years:
1992-1999 (E36 generation). The 323is specifically was produced from 1997-1999 in many markets.
Manufacturing Locations:
Primarily Germany (Dingolfing, Munich)
