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General Motors — A. Spark Plugs

A General Motors service procedure — check it applies to your exact model before use.

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Procedure

  1. 10. Exclusions: The repair or replacement of any warranted part otherwise eligible for coverage under this
  2. Warranty may be excluded from such warranty coverage if Crusader demonstrates that the engine and/or
  3. part has been abused, neglected, or improperly maintained, and that such abuse, neglect, or improper
  4. maintenance was the direct cause of the need for repair or replacement of the part.

Source: manual:L510001-12.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.