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This adds some information I didn't have that explains the desirability of full-flow filtration on these engines. Basically, the air filters were untrustworthy and there was a lot of bore and ring material shedding into the oil. I read long ago that a significant amount of wear in most engines...

I don't disagree, but did they compare against a bypass filter with a known rate of flow bypass, and was it apples:apples with respect to rate of flow to gallery, system main gallery pressure, and other variables? I have a feeling (backed by some personal experience) that the oil pumps of the...

Don't be knocking the oil filter. They come in two kinds: full-flow (what you're used to) and bypass (probably what the DUKW has). Full-flow oil filters had a lot of advertising hype behind them when they became common on engines in the 1950s. The oil path in a full-flow system is pump ->...

First, you have yet another guy jonesing for that DUKW. Beautiful. Second, yes. Oil and plain bearings have always gone together, but pressure lubrication is really a pretty recent addition to mechanism. Pretty much no steam engines used it (later ones used elaborate drip lubricator systems...