In November I brought a second hand twintop with 61k miles on clock. Its more of a project atm. I Serviced the gearbox oil today, but i was shocked because there was only about 0.5l of oil that drained. The engine is the Z16XER which I believe it has the F17 box on this. Am I correct to say the gearbox oil capacity should be 1.6l? There's no leaks so I'm slightly concerned why only 0.5l was in there.