Hi Guys, just been reading this thread, the gearbox in my x1/9 leaks a bit of oil and I have been topping up with Castrol EPX 80w90, is this OK? The gearbox synchro is a little weak in third and shot in first but other than that is ok, I want to try and put off rebuilding it for a year or so (need the money to sort the body work!) and hence want to make sure that I am filling it up with the correct oil!