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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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