what to use and how much?

 

75/90
Not sure on how much though.

 

3.1 litres. I usually pump it in with an oil syringe as it will start to run back out, making you think its full, once you get 2.5 litres in there, but you really should try and get the whole amount in and pumping it will help that.

 

without taking the gearbox out, if draining the box to just change the oil theres no way of draining it completely dry is there ???. ie some old oil stays in the box due to the height of the filling hole ????. the reason im mentioning it is when filling up my box after draining, the box only took around 2 ltrs, i rang cts to check the capacity and they said there was a possibility there could be some in there when drained, maybe in the diff etc ????.

dave