Hi Richard,

I got the oil from BVM. It comes with a little syringe. I jut put about 1cc into each line that goes to the retracts. Then I put some into the line that goes to the valve. You get a little oil escaping when you disconnect the wing . I havn't put any more in and I have had >40 flights with this model. I guess you would need to put some more in after a while.
I don't think it will stop leaks but just seems to make everything work smoother.

Regards