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I'm back and forth on catch cans. I like the concept but don't like the potential for additional crankcase pressure.
With that being said, I believe your points are valid but the concept of oil decreasing octane is typically more prevalent on port injection cars. With DI, that shouldn't be much of a concern. And remember, most fuel has a built in octane additive which is e85. The majority of fuels have a 10% e85 blend which obviously slightly decreases gas mileage but from a performance perspective, e85 is great. The effective octane of e85 is like 107 octane. Addtionally, e85 helps with egts especially on direct inject cars. So I can't see how running a 93 tune while using quality 93 gas is the problem with the bm3 tune.
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