To ensure reliability, purchase GM part # 55487655 Seal, O/Pmp (O Ring). It is sometimes referred to as Cadillac Oil Pump Gasket. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Cadillac CT6, XT4, XT5 models.
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