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Common BMW E46 325i (M54B25) problems and how to fix them

• Cooling system failure:
  - Replace expansion tank, radiator, and water pump preventively
  - Use quality parts and proper coolant
• Window regulator issues:
  - Replace with updated parts
  - Lubricate tracks regularly
• Oil leaks:
  - Check and replace valve cover gasket, oil filter housing gasket, and oil pan gasket
  - Use high-quality gaskets and proper torque specs
• VANOS system problems:
  - Replace VANOS seals
  - Consider rebuilding or replacing the VANOS unit if issues persist
• Suspension wear:
  - Replace control arm bushings, ball joints, and shock absorbers
  - Upgrade to polyurethane bushings for longevity
• Alternator failure:
  - Replace with a high-quality alternator
  - Check and replace serpentine belt if necessary

Regular maintenance and addressing issues promptly can significantly extend the life of your E46 325i.