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BMW E24 M635CSi: The Grand Touring Icon with Motorsport Pedigree

The BMW E24 M635CSi, produced from 1983 to 1989, is a revered grand tourer that blends luxury with high-performance engineering. Powered by the legendary 3.5-liter M88 inline-six engine, derived from BMW’s M1 supercar, it delivers 282 horsepower and a thrilling driving experience. Known for its sleek, shark-nose design and luxurious interior, the M635CSi is a rare and collectible model that embodies BMW's commitment to combining performance with elegance. With its motorsport heritage and timeless appeal, the E24 M635CSi remains a highly sought-after classic among enthusiasts.

Common Issues and Servicing Requirements for the E24 M635CSi

The BMW E24 M635CSi, while a celebrated classic, has several common issues that owners and potential buyers should be aware of, largely due to its age and the complexity of its components. Here are some of the most common problems:

1. Engine and Drivetrain Issues

  • Timing Chain and Tensioner: The M88 engine uses a timing chain that can stretch over time, and the tensioner may wear out, leading to potential timing issues and, in severe cases, engine damage.

  • Valve Adjustments: Regular valve adjustments are crucial for maintaining performance. Neglecting this maintenance can lead to poor engine performance and increased wear on the valvetrain.

  • Fuel Injection System: The Bosch fuel injection system, while advanced for its time, can develop issues with age, such as fuel injector clogging or failure, leading to poor running conditions or starting problems.

2. Cooling System Issues

  • Radiator and Hoses: The cooling system components, including the radiator and hoses, can become brittle and prone to leaks over time, leading to overheating risks.

  • Water Pump: The water pump is known to fail, which can cause overheating if not replaced in time.

3. Suspension and Steering Components

  • Suspension Bushings: The suspension bushings, including those in the control arms and subframe, can wear out, leading to a loose or vague steering feel and uneven tire wear.

  • Shock Absorbers: The original shock absorbers may lose their effectiveness over time, leading to a harsh ride and diminished handling performance.

4. Rust and Corrosion

  • Rust-Prone Areas: Like many older BMWs, the E24 M635CSi is prone to rust, especially in the wheel arches, sills, floor pans, and around the trunk and windshield areas.

  • Sunroof Drainage: The sunroof drains can become clogged, leading to water ingress and potential rust in the roof and surrounding areas.

5. Transmission Issues

  • Clutch Wear: The clutch can wear out over time, particularly if the car has been driven hard, leading to slippage or difficulty engaging gears.

Regular Maintenance and Care

Given its age and performance orientation, the E24 M635CSi requires diligent maintenance to keep it running smoothly. Regular inspections and addressing these common issues promptly can help preserve this classic's reliability and driving enjoyment.