-no manual flushing of tanks required
-buffer for lube and light oil
-content can be read out coveniently
-tilable upscaling
Print explained:
Heavy oil gets fully consumed by Lube. Heavy oil only rises if lube is full.
If Heavy rises over 100 units, then water is supplied to heavy cracking.
Max. 24k units of light oil are buffered for flamethrower or solid/rocket fuel.
If light oil is over 24k units, then water is supplied to light cracking.
Afterthought: If petroleum gas ever rises over storage limits, then the excess could be converted to solid fuel. This petro solid fuel should be used with prority over light solid fuel for rocket fuel crafting to keep light oil flowing.