Some Trannies Have Dip Stick But Thats Mostly Auto Tranny which have....
On Manual Trannies...There's Place Or Bolt On Gear Which Is Opened to Check Oil Level As Well as To Pour Oil Into Gear Oil...!
Ask Some Mechanic To Check It.......!!
IF You Need To Replace Gear Oil...
Use Caltex SAE 140 and it takes Your Almost 2.5L Of Gear Oil... Get 2 1 Litre GearOil Bootles and Ask Him to Drain All Old Oil and Add Fresh One....!
Regards