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10. What causes hydraulic lifter noises?

Primary Causes:

  • Camshaft cam wear
  • Air/foam ingress in the hydraulic compensator
  • Production errors
  • Clogged/collapsed oil filter
  • Clogged hydraulic compensators or lubrication channels
  • Incorrect engine oil selection
  • Engine overheating
  • High mileage, exceeded drain interval

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