On piston engine light aircraft a new, rebuilt or re-manufactured engine is run in flat out but with careful attention to oil temperature. When oil consumption has stabilised to minimal level it's deemed run in, usually after 10 -15 hours from memory. Those that have endured continued operation at low power levels can allow bore glazing and consequent high oil consumption. The glaze can be bust by operating at high power levels, again to reduce then stabilise oil consumption. This trick is often used by ferry pilots prior to a long sea crossing across continents.
On Classic Mogs being discussed here the oil light is driven by pressure so only comes on before engine start or for a second or two after oil change until filter is filled (always partially fill mine first). On the CX cars though there is no dipstick but a selectable readout on the display. An owner recently suffered the oil warning light coming on but solved by adding oil until display read 5/4. No I don't understand either but it worked in extinguishing warning.
