Ford Performance catch can - capacity & maintenance

[Luke17]

Hey, I'm looking for information about maximum safe capacity of the M-6766-A50 without any chance of overflowing and some maintenance schedule tips. Last time I emptied about 1 cl after 1.5k miles and I'm wondering if it's still safe amount our should I be more careful about it.

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[GregO]

Not exactly a measured volume but I go about 10k between oil changes and I’ve never seen the level in my FP catch can above 2/3rd’s full, typically 1/2 full.
This is all dependent on ring seal. Guys that insist on full syn early in the ring break in period tend to see more oil.
Knowing how to achieve that last 20% ring seal makes the difference in both blow-by and max horse power.