mmmm thats a good question...
Yes there should be an easier way to do it...
This reminds me of a way to pump petrol from one car to other using just a flexible pipe...!
you need to raise the old tank from the ground, let say stand it over some blocks or a table...etc...
Get a flexible pipe/hoze like those sold for watering gardens...
put one end of the hose into the older tank until it reaches bottom of the tank , and with your mouth (or a pump) pull air strongly...! yes not easy job...! :D and i never did it before... once you oil is going out from the other end, it will keep flowing through the hose because of air pressure until the oil is emptied...!
ofcourse the other end should be in another container...
The issue is:
as long as the level of oil in the old tank is higher than level oil in the used container then oil will keep flowing...!
Regards and good luck...
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