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If it were done properly - yes, I believe so. As I mentioned, the density of these fibers is specified for the flow range of air that is to pass through it. The lower the density, the higher the flow, but if you lower the density and subject it to low-flow air, many oil aerosols will pass by the "trap" and end up in your intake. This is why I chose a low-flow coalescing filter.
Needing one bad. Replaced T/B with a Shaner unit and car idled bad, forgot to swap throttle blades. Replaced the blade about 100 miles later and there was already a buildup of oil in the T/B I just put on.
For the record, the last oil change was the only time I noticed any oil consumption. It went over 5k miles though (my DIC said LOL) and I was doing spirited driving nearly every weekend, something I hadn't done before.
Well, after reading this post and others on this subject, I have just placed my order for an Elite Engineering oil catch can. Even though it is the highest price of all the others, I also feel it is the best made on the market and will do the best job of protecting my engine. Great product.