...READ the bottle,or just look at the side of the bottle "the WHITE" BOTTLE ...red bottle is called 911 because it is for "Emergency's" when you are already gell'd... good day...HAMMER DOWN !

 

I use 16 oz for every fill up (white bottle) never seen 911 any way dont need it this far south but the white and gray bottle of ps is used year round 16 oz at a time per fill up 35 gals

 

The PS stuff has been fine for me. I use the gray bottle in the summer and the white bottle in the winter. I use at the suggested amount of 16 oz. per 50 gallons ( i have a 60 gal. under-the-belly tank). I think the bottle says to double it for better cetane boost.

I've been in the -10 to -15 degree F range numerous time with no jelling and it has lubricity enhancers, too, for the injectors, etc.