Just wanna know what fork oil to purchase for yamaha virago 250, 1984. And also how much to use

Hi m8,, grab your self a meduim grade fork oil,,and get half a litre,,put half of the half litre bottle in to each fork leg,, if u can only get 1 litre bottles, put a quarter of the bottle in 2 each leg,,leaving half a bottle,, sorry if i soundid like a maths teacher there, but u would be amazed wot questions are asked in here,,lol,, cheers m8