Hello, thanks for the feedback!
It should pollute on its own, I'm not sure why it's doing that.
I didn't think about quality scaling on the modules! That's a good point. (I don't usually play with quality.)
I'm planning to switch the fracking towers to use steam over lubricant, but there's a bug in the engine meaning you can power a fracking tower using any miniscule amount of fluid, so I'm putting development on this mod on the back-burner until that's fixed.
Previously I had this mod be much weaker, so I guess I over-re-balanced it.