How many of ya'all are running one ?

I don't worry too much about it with a motor like my old 97 Cummins , but if you have a newer motor with a common rail system they are much more fussy......I run an additive in every tank full when driving my 08 Ford 6.4

ran across this study awhile back and the results surprised me......

http://www.johnfjensen.com/Diesel_fuel_additive_test.pdf

some of the old standbys that I liked ( such as Howes , Power Service , Stanadyne) don't look so good....as a result I switched to running Opti-Lube in my 6.4