I have twin 120ho Ford Lehmans fitted to our boat and just been told the oil in the Minimec fuel injectors should have been changed. Have had the boat about 5 yrs and clocked up about 600hrs. I would like confirmation these injectors have lub oil and if so the process for changing the oil. Looking at the injectors not readily apparent drain hole or filling point, also should I do anything additional as so long between oil changes. Any advice greatly appreciated.