If you're looking to preserve the gas for long term storage, you'll want something like Sta-Bil, which is a feul stabilizer. For top end lube, Marvel Mystery Oil (yes, it does work) or Lucal Feul Treatment is what you'ld want to use.
The correct ratio of stabilizer/top emd lube to feul amount is listed on the container. Usually about 3 oz. to every 10 gallons of feul.
