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05. Is it necessary to flush the engine before switching to another oil?

Necessity of the engine flush:

  • Before upgrade to a superior oil specification (e.g. API SL replaced with API SN)
  • Low quality (high sulfur) fuel used
  • Previous drain intervals unknown or OEM recommended intervals exceeded
  • Questionable quality of the oil used earlier
  • Previous product data unavailable

Purpose of the oil flush:

  • Removes accumulated sludge and deposits
  • Removes drained oil residue, wear particles and by-products of the fuel combustion.
Previous 04. What determines the oil change interval?
Next 06. If the oil is expired, can I still use it?
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