BMW 7 Series E23 735i
Model overview
A refined classic sedan whose ownership quality depends heavily on corrosion, restoration standard, service records and the exact six-cylinder specification fitted.
Pros
- Comfortable, spacious classic BMW sedan.
- Smooth six-cylinder petrol character.
- Strong enthusiast and parts knowledge.
Cons
- Rust and age-related deterioration can be extensive.
- Electrical and luxury equipment may need restoration.
- Specifications vary substantially by year and market.
Common problems & ownership concerns
Potential impact: Low · Medium · High. This describes possible consequences, not fault likelihood.
- Body corrosion in structural and panel areasHigh
- Ageing electrical and interior equipmentMedium
- Suspension and steering wearMedium
Maintenance
Follow the installed engine’s documented schedule and verify coolant, belt, hose and fluid history by VIN and engine code.
Engine overview · 3.5L 6-cyl PETROL
A durable classic straight-six engine, but condition varies widely with age. Cooling-system maintenance, oil sealing and fuel-management upkeep matter more than the original catalogue specification.
Pros
- Smooth naturally aspirated six-cylinder character
- Straightforward classic mechanical layout
Cons
- Age-related faults can be expensive
- Cooling and sealing condition varies widely
- Equipment differs by year and market
Common problems & ownership concerns
Potential impact: Low · Medium · High. This describes possible consequences, not fault likelihood.
- Ageing cooling-system componentsHigh
- Oil leaks and hardened sealsMedium
- Timing-chain and tensioner wearHigh
- Fuel-injection and ignition ageingMedium
Maintenance
Follow the confirmed VIN-specific service information and prioritise cooling-system, timing-chain, ignition and fuel-system records.
These are general ownership concerns, not a diagnosis. Equipment and engine details vary by version and production date.
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