I have used the power service... had no problems. The last 5 years I used Howe's lubricator,,, recommended by many 'big rig drivers', then this last fall I have switched to Stanadyne performance formula. They claim that it beats howe's hands down in all regards, lubricity, gel protection,cetane booster and many other things, I love it!!! The main thing is to get an additive that contains NO alcohol,,, they say it is hard on the fuel system,,, too dry. Hope this helps.