if memory serves, the capacity is 1.5 liters. I'll have to double check my manual when I get home. Easiest way is to jack up your car to parallel level with the ground, drain the gear oil, then fill up until oil starts flowing out of hte side filler plug. that's how you know you're at optimal level

use 75w90 or 80w90

 

Redline MT90 works great

 

...and ProLong transmission additive.