Old Diesel fuel Additive

[BX23S-1]

That's a good idea, but I have to ask...

Is the diesel additive safe to burn in a furnace?

I give my used oil to someone that burns it in their shop-building furnace.

Good question BT,
here is a link i found on the subject

Winter Heating Oil Additives and Other Steps For Your Heating System

 

[NH TC25D]

Never opened bottle with intact inner seal. 12-18 months from breaking the inner seal. Have pushed it to couple years after opening. Haven't ever looked for a "best used by date" on the bottles purchased. Using PowerService, the anti-jell cetane booster version during winters for more than a couple decades. No known issues.