Even renewables need tons of fossil to lubricate moving parts. Generators in a turbine alone is a massive oil guzzler. The world will always need oil until a synthetic lubricant that isn't insanely cost prohibitive.
We know how to make lubrication oil from other sources. Natural gas is a molecule easy to make from organic sources, and from there we already have the industrial processes to may synthetic oil. It costs a lot more than regular oil, and making your own natural gas drives up the cost, but it isn't impossible. Note that we can also make synthetic gasoline, last I checked (long ago, gasoline was $1.30/gallon) you could buy drums for about $8/gallon, the only people who paid that price were on a track and good enough that a better fuel was the difference between win and loss.
Yes, but the amount surely matters. If machines or car only require oil for lubrication, for example, that's probably one or two orders of magnitude less of oil needed.
