EP 80/90 is the old spec and would have went in box and diff back in the day,filling the box now is a good idea as it is a pain when all panelled up.
It will run out of the tailshaft if not carefull.
Cost : Little as possible.
Thanks : To those who by their generosity my build has progressed.
Its a handmade sports car not a flaming kit car !!!
If at first you dont succeed,avoid skydiving...
No parachute require to freefall,only if you want to do it twice.