1. Engine and Drivetrain

• Timing Chain and Tensioner Wear: The S38 engine’s timing chain and tensioner can wear over time, leading to potential engine damage if not addressed.

• Valve Adjustments: The engine requires regular valve adjustments to maintain performance, and neglecting this can cause excessive wear on the valvetrain.

• Fuel Injector Problems: Fuel injectors can become clogged or fail, leading to rough running or poor performance.

2. Cooling System

• Radiator and Hoses: The cooling system components, including the radiator and hoses, are prone to leaks and may lead to overheating if not maintained.

• Water Pump Failure: The water pump can wear out, which can result in cooling inefficiencies and potential overheating.

3. Suspension and Steering

• Suspension Bushings: The suspension bushings, especially in the control arms, can deteriorate, affecting ride quality and handling precision.

• Steering Box Wear: The steering box can develop play over time, leading to vague steering feel and requiring refurbishment or replacement.

4. Rust and Corrosion

• Rust-Prone Areas: The E28 M5 is susceptible to rust, particularly in areas like the wheel arches, sills, and floor pans. Regular inspections and rust-proofing are essential.

• Sunroof Drainage Issues: Blocked sunroof drains can lead to water ingress and rust in the roof area.

5. Electrical Problems

• Aging Wiring Harness: The wiring harness can degrade, leading to electrical issues such as intermittent faults with lights, windows, and other systems.

• Instrument Cluster Issues: The instrument cluster may develop faults, such as inaccurate readings or malfunctioning gauges, due to age and wear.

Proper maintenance and proactive care are essential to keeping the E28 M5 in good condition, allowing it to continue delivering the driving experience it's known for.