if as you say this is a tier2 C.A.R.B. truck, the engine may well be fitted with not only a crankshaft sensor that will want at least 1 complete engine revolution to be sure it sees the #1 cylinder ignition spot before it gets any spark, and may also have a low oil pressure shut off that would require a certain amount of oil pressure before it allowed a signal to the coil. Tier 2 trucks do NOT have or need the 0.5 (not 1.5 sec) sec time delay,
these are "good things".
This motor (as well as any other high compression motors with H.E.I.) can have a "rock-back" effect from the fact the motor always stops before T.D.C. on the compression stroke, and as soon as there is spark (key switch turned to on but not crank, micro second before key gets to crank position), if the motor's flywheel is not moving in the correct direction, that spark will cause the motor to turn in the opposite direction from the way the starter is just about to engage. To add to that, the way this starter mounts, and you may find more than expected breakage of the block near where the start mounts and the starter tearing nosecones. The delay, or waiting until the crank sensor has seen #1 T.D.C. 2 times, cures that problem.
As long as the motor has oil pressure, it doesn't wear the motor any more to turn at 150 rpm [starter cranking] than at 750 rpm, and unless you are using the very least expensive oil filters possible, then the engine should be able to pretty much get oil pressure within a few seconds cranking and it IS better to spin at slower speeds if you don't have full oil pressure. You may find better [as in more $] oil filters have a valve and spring to hold residual pressure when the engine is not turning, and not only to allow bypass when clogged.
starter wear is far more likely as a result of restarting each time the operator gets off the seat to scan a load than it will be from starting once with low oil pressure each day, but this -is- just one more spot where proper operator training can save lots of money, as well as changing the oil and filter at correct intervals and NOT using the least cost after market filters.