Since you have such large pieces of metal heating up at different rates the clearances are fairly large which lets lots of oil loose.
DC-ATE - The ratios are still in part 25 if anyone wants to design a new large piston engine. Thirty to one without a tranfer system, 40 to 1 if you can transfer oil. Flew some converted T-29s that had to have an aux oil tank installed because the Air Force had larger fuel tanks than the regular 240.