How about, depends on the temprature

 

I buy Stanadyne at a Pilot truck stop a couple exits up the road from me. Walmart wont have it.

 

Thanks everyone, ill steer clear of the Lucus in my Diesel

Here is my XDP additive that ive been running for like 6 months, dont know if it helps or not. I bought it with a bunch of my Performance stuff from XDP.
It boosts Cetane by 5% & cleans Fuel system among other things, for year round use.

What do u guys think of this stuff (the Link is posted below)

XDP Diesel Power Plus Fuel Additive

 

I read about the boost of 5% too. That comes out to about a 2.5 cetane number boost. The Power Service stuff I use gives you a 6 point boost & lubricates injectors too. It would love to see a professional & credible study that compares the top rated "magic in a bottle".