unfortunately we don't have access to Suzuki Circulars. Best we can see is the cars owners manual.
Yes, This is one reason i have been arguing everywhere that 0W20 could be problematic for this engine. this is differently tuned for use in Pakistan. Since gear oil change the car is very much responsive. Either me and the car we both have agreed on some terms but definitely it is performing better now.
About gear oil yes 75W was the correct oil Suzuki entertained my query what ever BS happened but they corrected the mistake.
However i found a paper on pakwheels of the japanese model which said AGS gear Oil quantity was 2.4L where as when replacing the dealership had a 5 inch wide book which said AGS quantity is 2.2L.
I told them do what ever you want to. if i have any issue il keep coming back.