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Why are the vanos piston O-rings failing?

failing O-rings piston vanos
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Why are the vanos piston O-rings failing?

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The OEM O-rings are made from Buna, and this material is not capable of resisting the engine temperature and chemical environment. As an outcome the O-rings are hardening, shrinking, and flattening. This causes them to lose their functional characteristics causing the vanos to fail.

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