Found the thread:This is very interesting considering how much catch cans are being championed as the best solution. It reminds me of some research I saw posted on the bobistheoilguy forums a few months ago (I’ll share if I can find it again). The findings saw a much higher rate of deposits on engines using full synthetic exclusively, which was fascinating. The post was a couple years old, but I’m surprised it didn’t generate more discussion about the general best practices for gdi engines.https://docplayer.net/38978662-Cons...tion-in-gasoline-direct-injection-engine.html
Positive crankcase ventilation(Blow-by) was not related to carbon deposit formation
This is pretty scary because so many believe their c̶a̶t̶c̶h̶ condensation cans are doing something positive. I'd consider these three ideas. Condensed fuel is wasted fuel. Captured/condensed oil could benefit engine as upper cylinder lube. Water vapor could reduce detonation/preignition like water injection.
Since condensation cans, with their plumbing, can decrease PCV flow, it can increase oil contamination by not allowing enough fuel/moisture/vapor to vent. So, one must weigh the pros/cons. This is why none of my cars run catch cans.
Want to add a vacuum pump? Go for it
Note: it’s entirely possible I am misremembering the chart that was posted. But if I read it correctly longer intervals between changes caused more problems with Group 4 oils.