My Egli Godet Sport GT has been suffering from a persistent oil leak that I have been unable to trace for some time. Even when the bike had stood for a while it continued to drip a little, despite all efforts to seal joints etc. Today, after checking "the books" I decided to drain the gearbox oil and measure the amount. There was quite a lot of soft gunge adhering to the drain plug, but the oil looked clean enough. However I drained 1.3 litres of oil! Depending on which book you read the recommended amount is 2 pints or 1litre. Since 2 pints is a little less than 1 litre clearly 1.3 litres was too much. So I refilled with one litre of a green 20/50 mineral oil. Hope fully if it continued to leak the green would show up. ( my engine oil is brown) After it had all settled I checked oil level against the mark on the dipstick. The oil was just, and only just, showing on the dipstick, nearly half an inch below the mark on the stick. Obviously what has happened is that the dipstick was marked and inserted and then someone filled the oil up to the mark, WHICH WAS IN THE WRONG PLACE. I made a new mark on the dipstick (and a note in the file about the correct mark). I then went for a 40 mile ride, giving it a thrashing through the gears , and parked it over a carefully placed, clean plastic sheet.. It has only been about 5 hours since the end of the ride but although there is the odd drip (of indeterminate colour) there is very substantially less loss than before,.OK by me. Since twin gearboxes do not, apparently, need regular draining, YOUR box MAY have too much or too little oil. It is simple enough to drain and check, maybe it's an idea to measure/change gearbox oil a little more often, what do you think?