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In regular GDI cars this can really extend engine life (in theory anyway) by preventing oil/gunk/carbon from collecting on the backside of the intake valves. In our car, the intake valves aren't dry so it's less of a concern. But that oil and gunk does get mixed with the air/fuel mixture and can effectively reduce the fuel octane (at least during those times when there's blow by).
It's an easy mod. If done right there's no down side and can only help but does require some upkeep
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