Is there a difference between 2 stroke and 4 stroke chain? Which is better? What kind of grease do you put on each?Which lasts longer?

 

2 or 4 stroke makes no difference in the chain. There are 2 different kinds of chains though. O-ring and non O-ring. From what I understand, O-ring chains can handle the more torquier engines made these days. I am no mechanic, I'm sure more valuable info is on the way.