Which auto oils are less harmful for the atmosphere, natural or synthetic?

Question

Which lubricant oil causes less greenhouse gases?

Answer 1

To answer your question it would be a natural oil.  The person above said Hydrogen which is natural but they didn't specify that.

Answer 2

Hydrogen.  The only thing it produces when you burn it in your car is water.

Answer 3

Are you considering "oil" in the sense of lubricant or fuel ???

I guess you were speaking about lubricants

So different things are to consider:

- a fraction of oil is burnt in the motor (unfortunately). Which gases are emitted in this case ? (it is more a question of soot pollution)

- how good the two oils are comparitively for the lubrication (5% of the world energy could be saved by decreasing friction).

- are they going to be reused in a cycle economy as a waste fuel ? or refined again to be reused ?

Finally, there are 100% natural oils that are starting as alternatives. I believe they have the lowest impact.