I use Stanadyne Performance with every gallon of diesel. Also recommended by the dealer. I have had not problems using it. The bottle did cost about $9, but costs more now (about $15) and I think it is supposed to treat 60 gal. I also use Sta-Bil diesel stabilizer.
- you live in colder climates like me where I snow blow or are moving wood to the boiler etc... at -30f often and your blend is 20/80
- if you are using biodiesel like Ruby Red.
- based on what stage your fuel supplier is at in the switching from grade #2 diesel to the blended #1 and #2. #1 has a lot of kerosene in it and doesn't have paraffin. Depending where you live often winter blend is moving to around 20/80 at mid season. I always get the 50/50 blend cause -30f is really chilly and I see the 20/80 blends some fuel suppliers sell is clouding up at these temps and rather be safe then sorry.
Fingers crossed I have never had to use 911 or similar buying the 50/50 vs the 20/80