I use Amsoil/oil/filter and buy it in the
1 Gallon container. After I remove the old oil
I always put it into the container i just used.
Have 2 containers of used oil from my last 2
changes and they came out even.
Would have to be quite a leak or smoking like
an SOB to even come close to using up your oil. And
would be pretty hard to miss.
I don`t ride near as much as I'd like to, so
just got into the habit of changing it at the beginning
of winter.That way if it does sit for any length of time
the oil is fresh.