Reliability GuideCommon Problems with the
Common Problems with the
1984 BMW 5 Series (E39)
The 1984 BMW 5 Series (E39) has an excellent reliability record with no widely reported common faults for this model year period.
Buying Tips for 1984 BMW 5 Series (E39)
- Inspect the jacking points, sills, and boot lid for severe rust, which is the main killer of UK E39s.
- Check the entire cooling system (radiator, water pump, expansion tank); the plastics become brittle and will suddenly shatter.
- Listen for knocking from the complex multi-link front suspension, indicating worn thrust arm bushes (the 'E39 shimmy' under braking).
- Ensure the instrument cluster pixels are fully readable, as they almost universally fade or drop out entirely.
- Check the M52/M54 straight-six engines for high oil consumption and leaks around the rocker cover gasket.
- Verify the ABS module functions correctly; warning lights (the 'trifecta' of ABS, Traction, and Brake lights) often mean a failed module.