We have several trucks and use the same chemical in all of them... From our CAT to Cummins engines...
I've learned that in Canada the government sets standards for all fuel and its blended down in late Sept and stays that way until spring...
In the US there is no standard or government suggestion but its left to the local bulk plant and most guys in the station have no clue... and usually whats in the ground in the station is short of where it needs to be if there is a cold snap that's just moved into the area. . or you've bought fuel in a warm area and driven to a cold spot...
We use fleet cards and after one gelled up 15 years ago I learned a lot about this whole process... . I learned that 95% of whats in the bottle to prevent gelling will also add to the cetane rating and most all brands are the same...
Usually the more you pay represents a higher concentration so fewer oz's treat more fuel...
So we purchase a chemical, and 8 oz. treats 125 gallons... about what we put on with each tank full as most of our trucks have extra tanks... we have decided to treat the year around... . the chemical is a cetane improver as well as an anti-gel additive... and as I remember a case (2 - 2. 5 gal) is around $175. 00 but treads something like 8,000 or 10,000 gal. .
Your using such a small amount I'm sure that even if its on the shelf for 2 or 3 years it won't hurt the new systems in the 6. 7L engines... . at least we didn't have a problem...
I've learned so much about this I could write another couple of pages but I'm going to step off the soap box... .