@bonifartius @IAMAL_PHARIUS They say gas goes bad after a year, in my experience its good for a solid 2 years. Diesel used to have a super long shelf life, but the eco fags took the sulphur out of it and now it has a shelf life more similar to gas.

You can overdo it with fuel preservatives, be kind of humorless with following directions. If you put too much in it'll make whatever you use it in run like crap.