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True that if you are really letting it get up to operating temperature for an hour or so. However, on a short run if the oil is on the cool side the weight of your oil will be 10 - 20 instead of 30 - 40. I would change the oil and see how it runs. My 803 is on the low side of the pressure...

2nd black page is the Lubrication Order. It calls for OE-HDO-15/40 or OE/HDO-30 when ambient is above freezing. https://www.steelsoldiers.com/showthread.php?175591-MEP-803A-All-the-TM-s-you-need

IROAN Inspect and Repair Only As Necessary h. IROAN. That maintenance technique which determines the minimum repairs necessary to restore equipment, components, or assemblies to prescribed maintenance serviceability standards by using all available diagnostic equipment and test procedures and...