How much oil would I need for 5kg of chicken, if I were to reuse that oil 3 times? Details below

I am doing some costing for the first time for a food business I just got into. I'm going out of my mind trying to figure out how much oil I need for x kilograms of chicken and what happens if that x amount increases, since I do reuse the oil (for deep frying) up to 3 times. In the previous case it was 3 times for 4kg of chicken total before the oil went un-usable.

So here is a clearer picture:

If, in the span of 10 days, 4kg of chicken needs 1.5litres of oil (which is reused 3 times for those 4kgs), how much oil would most probably be needed for 5kg of chicken in the same span of 10 days? How much for 6kg, 7kg, and so on?

Please help me get started, I really appreciate it. Thank you in advance.

Well it seems to me as if you have a simple proportion problem here, unless I am misunderstanding your question. In this case since you will always reuse your oil 3 times, the reusing oil part has real