I was asked by one of our technicians the other day, should he oil the face of a R410a VRF flare nut? I said |I was sure he should he then asked what oil should be used? I said I had always used zoom spout high quality turbine oil in the past, but I am not sure if this is the correct stuff to use on R 410A, particularly and something as expensive and a R410a VRF system. Can someone please tell me should we still oil flares and what oil is recomended?