This is the 14601st most frequent Turkish word.
petrolünün
"Of its/his/her petrol" or "its/his/her oil."
The word 'petrolünün' here means 'of its oil' and refers to the possession ('the country's oil').
Ülkenin petrolünün yüzde yetmişi ihraç ediliyor.
Seventy percent of the country's oil is exported.
The word 'petrolünün' here refers to the company's oil, showing possession and the quality attribute of the oil.
Firmanın petrolünün kalitesi uluslararası standartlara uygundur.
The quality of the company's oil meets international standards.
In this case, 'petrolünün' describes the oil being tested for its effectiveness, linked to the research facilities.