[TJay74]

Elite is correct, removing the oil from the intake air charge is not the only benefit. It helps with detonation issues and lessens the chance of detonation. That along with a cleaner TB and intake manifold coupled with cleaner intake valves and combustion chamber are all the benefits when added up together.

I asked the Chief GM Truck engineer on their thought back in 2015 when I was working with them on some issues on the K2xx (2014+) truck line. The engineers reply was a catch can has nothing but positive benefits, the main reason GM would not approve them is if they rely on the owners to empty a physical catch can it wont get done. Then once the can gets full you take a chance of liquid oil being sucked into the combustion chamber and the issues that can arise from that happening.

It is a gamble now, as long as the vehicle makes it past the B2B or the 5yr/60k powertrain warranty then GM doesnt care as the repairs will not be made on their dime, it will be on the owner at that point.