In 99 my Dad gave me his old boat. It had a 115 'Rude with VRO. When we took it out on Memorial Day weekend before I brought it home, it locked up. Luckily, no damage was done. (Just sold it a year ago) Had a couple of quarts of oil on board, so we mixed the oil in the gas tank and continued on. The VRO ceased to work. First thing I did when I got it home was remove that d### VRO. If it stops working, you may not find out until the motor is destroyed.
No more mixing gas and oil for me. Last spring I bought a 23 foot Sea Fox with Suzuki 4-stroke power. Love it.