How do you change oil on a 1982 Goldwing?

The drain plug is at the back of the engine, drain it, then change the filter which is at the front of the engine. Since there is no dip stick, just a little glass window, start with 3.2 L of new oil, and check the level with the bike on the center stand. Use of a flashlite will come in handy. The easy way to see the level, start the engine, and with the flashlite look in the window, and shut the engine down. You will see the oil settle.