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Originally Posted by AeroDave
Do they replace them in pairs?
GM's policy is to only replace failed parts. Their shock policy is only to replace the leaking shock, not its mate.
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• Shock absorbers/strut assemblies are fluid-filled components and will normally exhibit seepage. Seepage is defined as oil film or dust accumulation on the exterior of the shock housing. Shock absorber/strut assemblies are not to be replaced under warranty for seepage.
Important: Electronically controlled shock absorbers (MR) may have a tendency to attract dust to this oil film. Often this film and dust can be wiped off and will not return until similar mileage is accumulated again.
• Defective shock absorber/strut assemblies will have a visible oil path or drip coming from the component. A visible oil path or drip coming from the shock absorber/strut assembly should be replaced as a defective component.
• Only defective shock absorber/strut assemblies should be replaced. Do not replace pairs unless both are defective, unless otherwise instructed in the Service Manual and/or Service Bulletin.