On our cars, when not forced induction anyways, dumping a can every 2-3K miles seems prudent. The tradeoff is now you have another maintenance item to take care of: emptying the catch can of condensed vapors every once in a while. Should result in a cleaner engine over the long haul, and slightly increase the effective octane rating of your A:F mix. The idea with the catch can is to put a baffled can in the path of the vapor flow so that most of the oil will condense out and collect in the can, rather than get fed to your engine to burn. The crankcase vapors are mostly oil vapor, so the PCV system basically puts a small amount of oil into your air intake at the intake manifold. It's using intake vacuum to scavenge vapor from the crankcase so that the crankcase's pressure is regulated (otherwise it would build up pressure and blow oil seals, etc). The 370 (like all modern cars) has a PCV system, which you can basically think of as a one-way-valved tube from the crankcase back into the intake.
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