I’m wondering if the length of the dipstick on my C twin gearbox is different to others. After totally draining the oil and refilling it with exactly 1 litre, the new oil level on the stick is showing on the ‘0’ mark of the flat, which I understand is higher than recommended. This was before I started the engine and the same level after riding it for a few miles. Now, given that 1 litre is significantly less than the 2 pints or just under the box is supposed to take, could it be my dipstick is too long and my box is running on less oil than it should be.