[THEFERMANATOR]

As far as I know, ALL VRO systems vary the oil ratio from idle to running under load. That is the whole point behind the VRO, VARIABLE ratio oiling. Early systems varied the oil and would run 100:1 at idle(which is fine), but they would only go to the 50-75:1 range at mid range RPM's which caused a lot of issues. For awhile they tried running 40:1 to help save some engines, but this was a double edge sword as it ended up with soot build up in the rings from the excess oil. I pre-mix them at 50:1, and rejet accordingly. After jetting they don't smoke much at idle(even extended trolling), and you know the oil is getting to it. Also be VERY watchful with VRO and air leaks in the fuel system. Even a small air leak in the fuel line going to the engine will cause it to over oil DRASTICALLY!