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Summary For direct-injection GM V8s, carbon buildup is a long-term maintenance issue, not a theoretical one. Oil vapor from the PCV system can coat the intake tract and valves over time, especially on engines that don't have fuel washing over the back of the intake valves. That is the core reason many owners start looking at an oil separator or oil catch can. This guide breaks down oil catch can maintenance cost, how much oil a catch can typicall...