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Summary The 6.6L gas L8T in the GMC Sierra 2500 and 3500 is built to work, especially under load. That same workload also increases crankcase vapor, which means more oil mist moving back through the PCV system and into the intake tract. Over time, that can leave residue where you do not want it. A catch can is a simple way to intercept that vapor before it reaches the intake. This guide covers how the Sierra 2500 PCV system works, what the Sierra...