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Bmw Bmw E32 7 Series

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BMW E32 7 Series: A Comprehensive Guide

The BMW E32 7 Series, produced from 1986 to 1994, represents a significant step forward for BMW's flagship luxury sedan. Replacing the E23, it introduced a new level of technological sophistication, performance, and luxury that set a new standard in the executive car segment. More than just a comfortable cruiser, the E32 was designed to be a driver's car, even with its grand dimensions. It competed directly with the Mercedes-Benz S-Class (W126 and later W140) and Jaguar XJ series.

Generations and Key Changes

  • First Generation (E32; 1986-1994): This single generation encompassed the entire production run. However, there were notable changes and improvements throughout its lifespan.

Key Changes and Milestones:

  • 1986: Launch of the E32 with inline-six (M30) and V12 (M70) engine options. Introduction of advanced features like electronic damping control (EDC), traction control (ASC), and double-pane windows.
  • 1987: Introduction of the 735iL long-wheelbase model, offering increased rear passenger legroom.
  • 1988: Introduction of the 750iL, the first German car since World War II with a V12 engine.
  • 1992: Minor facelift including slightly larger kidney grilles. Introduction of the 740i/740iL with the M60 V8 engine, replacing the 730i/735i in some markets. The 730i continued to be offered with the M30 in certain markets.
  • 1994: End of E32 production, replaced by the E38 7 Series.

Reliability & Common Issues

While the E32 is a robust and well-engineered vehicle, its age means that certain issues are more prevalent. A thorough inspection is crucial before purchase. Here's a breakdown of common problems:

Engine Issues:

  • M30 Inline-Six (730i, 735i):
    • Timing chain wear: Listen for rattling noises on startup, particularly on higher-mileage examples.
    • Cooling system leaks: Inspect the radiator, water pump, hoses, and thermostat for signs of leakage. Overheating can severely damage the cylinder head.
    • Oil leaks: Common sources include the valve cover gasket, oil pan gasket, and rear main seal.
    • Idle control valve (ICV): Can become clogged, causing rough idling or stalling.
  • M60 V8 (740i):
    • Nikasil cylinder lining issues: Affects some early M60 engines (typically pre-1994). Sulfur in fuel can corrode the Nikasil lining, leading to compression loss and engine failure. Compression testing is crucial. Look for engine codes ending in "-S1" as affected examples. Later blocks were Alusil.
    • Timing chain guides: Plastic guides can become brittle and break, causing timing issues. Listen for rattling noises.
    • Valve stem seals: Can harden and crack, leading to excessive oil consumption and blue smoke upon startup.
    • Cooling system vulnerabilities: similar to the M30, prioritize cooling system checks.
  • M70 V12 (750i):
    • Complexity: The V12 is inherently more complex and expensive to maintain than the inline-six or V8.
    • Cooling system: Two of everything! Cooling system issues can lead to severe overheating and head gasket failure. The V12 runs hot and is highly sensitive to cooling system deficiencies.
    • Distributor caps and rotors: The V12 has two of each. Inspect and replace as needed.
    • Throttle bodies: The V12 has two throttle bodies. They can become worn and cause idle problems.
    • Oil leaks: Similar to other BMW engines, valve cover gaskets and oil pan gaskets are common leak points.

Transmission Issues:

  • Automatic transmissions: Check for smooth shifting. Slipping or harsh shifts indicate potential problems. Fluid changes are crucial for longevity.
  • Manual transmissions (rare): Relatively robust, but check for worn synchros, especially in second gear.

Electrical Issues:

  • Central locking system: Can be unreliable due to vacuum leaks or faulty actuators.
  • On-board computer (OBC): Can display erroneous warnings or fail completely.
  • Power windows and sunroof: Check for smooth operation. Motors and regulators can fail.
  • Battery drain: Can be caused by a variety of electrical issues.

Suspension and Steering:

  • Suspension bushings: Wear out over time, leading to sloppy handling and noises.
  • Self-leveling rear suspension (SLS): Prone to leaks and can be expensive to repair. Consider converting to a conventional suspension.
  • Power steering system: Check for leaks and proper operation.

Body and Interior:

  • Rust: Check for rust in the usual areas: wheel wells, rocker panels, and around the windshield and rear window.
  • Interior trim: Check for cracked or faded leather, delaminated wood trim, and broken switches.
  • Double-pane windows: Can fog up if the seals fail.

Driving Experience

The E32 offers a luxurious and refined driving experience, striking a balance between comfort and performance. It's a comfortable cruiser for long journeys, yet still engaging on winding roads.

Pros:

  • Comfortable ride: The E32 excels at absorbing bumps and providing a smooth ride.
  • Powerful engines: The M30, M60, and M70 engines offer ample power for effortless acceleration and cruising.
  • Spacious interior: Provides ample room for passengers and luggage. The "L" (long-wheelbase) models are particularly spacious in the rear.
  • Timeless styling: The E32's classic design has aged gracefully.
  • Relatively affordable entry into classic BMW ownership.

Cons:

  • Age-related issues: As an older car, the E32 is prone to age-related problems.
  • Maintenance costs: Parts can be expensive, especially for the V12 models.
  • Fuel economy: Not the most fuel-efficient car, particularly with the V8 and V12 engines.
  • Complexity: The E32 is a complex car with numerous electrical and mechanical systems that can be challenging to diagnose and repair.

Buying Advice

Buying an E32 7 Series requires careful consideration and due diligence. Here's what to look for:

What Years to Look For:

  • 1992-1994 (with M60 V8): The later models generally benefit from minor improvements and refinements. The M60 V8 is a great engine, but ensure the car has an Alusil block (later production) to avoid Nikasil issues. Check engine code.
  • 1990-1994 (with M30 Inline-Six): Simpler and generally more reliable than the V8 or V12, but lacks the ultimate performance. These can be good value.
  • Well-maintained examples: Regardless of the year, prioritize cars that have been well-maintained and have complete service records.

What to Avoid:

  • Early M60 V8 engines (with Nikasil): Unless the engine has been replaced or rebuilt with Alusil liners, avoid these models.
  • Cars with significant rust: Rust repair can be costly and time-consuming.
  • Cars with major electrical issues: Electrical problems can be difficult and expensive to diagnose and repair.
  • Cars with neglected maintenance: Cars that have been poorly maintained are likely to have numerous problems.
  • Overly modified cars: Modifications can affect reliability and resale value.

Key Considerations:

  • Budget: Factor in the cost of maintenance and repairs when setting your budget.
  • Inspection: Have a qualified mechanic perform a thorough pre-purchase inspection.
  • Service history: Review the service history carefully. Look for evidence of regular maintenance and repairs.
  • Test drive: Take the car for a long test drive and pay attention to how it performs.
  • Check the VIN: Research the VIN to determine the car's history and specifications.

The BMW E32 7 Series is a rewarding classic that offers a unique blend of luxury, performance, and style. By following this guide and conducting thorough research, you can find a well-preserved example that will provide years of enjoyable driving.

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