Top Tier gas is a good thing to keep in mind when possible, but as has been stated - there are other factors at work here. I can't imagine "bad gas" alone would result in THAT much sludge. Not to mention that the fuel never sees the backside of the valves, anyways.
Unfortunately, it sounds as though the VW mechanics don't know how their own engines work.
Quote:
Originally Posted by clarkkent
So, Chevy's new LT1's (C7 Corvettes, 2016 Camaro SS) has direct cylinder fuel injection. We'll have to see if Chevy found a way to keep this from happening.
In a direct cylinder injection engine, it is way WAY more critical to have a catch can or something to keep oil particles from entering the intake manifold/intake runners. Because no matter what fuel cleaner you put in, it won't do anything at all but clean your fuel lines and injectors, won't do anything for the valves or intake runners.
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It has an integrated oil vapor collector on the valve cover side of the PVC system...but nothing on the plenum side. I will be curious to hear back from people after a hundred thousand miles have been put on some of these engines...But in the meantime, one thing's for sure...no matter how well Chevy engineered their new engines, as soon as I get a Gen Six, I'm putting a good oil catch can on the plenum side to try and prevent this...