I've owned a lot of Chevy big blocks and have worked them all hard.
One thing consistent with all of them when worked hard is they break down the additives in the oil then start consuming it.
You do an oil change then drive it for 4000-5000 miles without using a drop then suddenly it needs a quart, then another, then another...
Change the oil and it's good for another 4000-5000.
Being that you are working yours hard it is conceivable the same may apply.
Second thought;
Downshifting and engine braking (pretty common on old overloaded 3 tons with questionable brakes) the increase in vacuum during deceleration will pull oil past the rings and valve guides on a tired engine.
Last thought that may or ay not apply to your truck, aftermarket valve covers did not always come with the proper baffles to properly shield the PCV valve from sucking in oil mist.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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