I hope Rob can throw us a answer. Most people know the how and why DI engines can get dirty intake valves and the negative effect it has on a smooth running engine and decrease in performance. Has anyone had any issues? I was just about to buy a can of CRC intake valve cleaner. You can youtube it and it seems fairly simple. The problem is the location of the throttle body. I was going to insert my borescope into the intake manifold and look at the ports, I can't do it on this arrangement. I'm not having problems just wondering. I'm heading out to Colorado next week and sort of looking over everything. One thing that stands out about this engine is, I've not added oil since last oil change, 9000 miles of driving. Remarkable.