Your right about the coke bottle, keep the costs down. I race, and the only reason I keep my machines clean is to maintain cred at the track. Pretty cars generally don't get worked or have had too much spent to risk an off, while a filthy machine infers no pride, but each to their own.
Watch though if you start blowing heaps of oil out the breathers, means something bad like cracked rings, or pistons (4 of them)
I recall there is no crankcase hose though on a 33, but a return line from the turbo oil is there.