My oil setup that I made over the course of a world. It's a bit large scale, but it works for me. All modules are stackable on modules of the same type.
I made a spreadsheet that tells me how many machines I need to fully utilize a collection of nodes and how much product it will output. To add your own nodes to the spreadsheet, find a section that calculates for what product you want and copy it to below the other ones, remove the old node numbers, and add your own. All values (except machine amounts) are in units/s. I also realized that the coal numbers for plastic are wrong. I'm too lazy to go and fix this in every instance so it should be 1 coal per chemical plant.
https://docs.google.com/spreadsheets/d/1WA3aazgycVpM1QEO5CeA3QMcNiSIhxg-XkaIoAvmXrA/copy