Quote:
Originally Posted by ghosted
In a Direct Injection (DI) Engine, the fuel is sprayed directly into the cylinder itself. The reason that top-tier gas doesn't do anything for carbon/gunk buildup on these valves is because the fuel never sprays across the valves. In Port Injection engines, however, this is a valid point.
An Oil Catch Can is a device that allows PCV gases to enter the catch can before feeding into the intake (and across the valves), allowing oil vapors to condense and collect in the can instead of down the ports, causing buildup.
With DI engines, the dirty vapors coming from the PCV system are leaving deposits on the valves, and there is no fuel being sprayed across the valves to keep them clean (fuel wash).
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Thank you, seems simple enough that they should be doing this.