I need some advice on how much oil to put in my shocks as they are unique home made out of hydraulic tubes, but have Fox internals with remote resevoirs. 14 inch long, 12 inch travel X 2 inch diameter.

They had 750ml, but it was rusty and heavily contaminated so I am not exactly sure if it accurate.

Does it affect the performance of the shock if it is a bit less or more.