Hi, what is the gear oil type for a 5sp manual transmission, Daewoo Leganza 2.0 petrol, year 2002? I found that it should be a GL-4 gear oil, but I would like to know it a 75w80, 75w90, 80w90 or 75w140? As I dont have the original Daewoo Leganza manual, I ordered a Castrol Manual EP 80W-90 1 L, however, the merchant called me back and advised the 75W140, which is double the price of the 80w90. He said the winter is cold, this means maximum -7 degrees for a few days only, usually winter around +2- +6. So I need your advice, which is the original type of transmission fluid Daewoo put in the gearbox. Thank you for your help.

Cars & Trucks - Daewoo - Leganza - 2002 Daewoo Leganza