I just found out I didn't have to use a funnel for oil changes. The quart has same thread and screws perfectly onto oil refill spout. So, just save one empty quart for next time and cut out the bottom and there you have a clean oil funnel.
Amsoil is the same. They screw in pretty well, but I don't trust it to hold the weight of a full quart, but it is great for letting the emptied one drip in to get every last drop.
