May be an old video ,, but, in my opinion gives a good basic understanding, of oil lubrication ,,  Some may say , similar to a Harley engine..  Goes for about 10 minutes ..

Give it a minute or two ,, as it starts off as a holiday clip .... https://www.youtube.com/watch?v=lgtcTElNfF4

Dont know why you cant click on the link ,, so just copy and paste in your browser !!!  

PS,, you can click on the link !!!!