@TwinTurbo alluded to the same thing. If the “Add” line is lower the owner will have to add oil less frequently and be convinced the car requires less attention than it does. We see it today with so-called “zero maintenance” transmissions. Since my Corolla only uses a quart of oil in 3k at 118k I’m not that worried and I check my oil, coolant, brake fluid, battery terminals, etc. every week anyway.