Both vintage racing rules, as well as good decorum, require teams to catch any fluids that could potentially make their way to the race track surface.
Radiators, engines and rear ends are common culprits for overflowing fluids. Moroso offers a complete line of catch tanks. Most are available from Summit Racing.
Our advisor on this project, Cobra Automotive’s Curt …
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Just do yourself a favor and make the crankcase catch can BIG, Baffled, Well Vented, and supplied by LARGE hose from a LOW OIL Mist/Spray AREA. In 3+ years now I've had less than an inch end up in the tank and most of it is just water from condensation.
In reply to Asphalt_Gundam :
Thank you for the tip, we'll keep that in mind going forward.
I imagine it doesn't hurt to have more catch tank than you actually need.