|Simple Motor Oil Filling Tip
Getting motor oil from a plastic bottle into the Guzzi crankcase can be a little messy.
It turns out that the caps (the pointed ones you have to cut to open) from most 1 qt gear-oil containers will fit onto a motor oil container. To add oil or to fill the crankcase, put the gear oil cap on the motor oil container, then put your finger over the cap. Insert cap in the crankcase filler, remove your finger and squeeze gently. You shouldn't spill a drop.
The containers for Mobil 1 have a different sized cap, so this tip won't work if that's the oil you use.