I am breaking in an inverter generator with small air-cooled 80cc 4-stroke single cylinder engine. After the break-in, I will change the supplied mineral oil to a high-quality fully synthetic oil.
My plastic oil collecting container withstands temperatures of up to 85 degrees Celsius, which seems a bit low to me.
How many minutes I should wait after the engine has turned off because of fuel starvation, before I change the oil? I understand that the oil should never be changed when cold because it doesn't flow well when cold, but after the engine has been run, it might be very hot and therefore waiting for some amount of time could be beneficial. However, I don't know how long the wait should be, and the manual only says it should be changed "when warm" but doesn't specify what "warm" means (but presumably "warm" is different from "hot").
I understand that oil can easily have temperatures of above 100 degrees Celsius, and even more if the engine has been highly loaded (it my case during break-in I have a varying resistive heater load that is up to 37% of the maximum permissible load -- the manufacturer has specified that 50% load should not be exceeded during break-in). So an immediate oil change after engine has turned off could possibly damage the plastic oil collecting container.