There are much bettter products out there than 2 storke oil. I use Lucas, and have had super results. Stanadyne (was Roosa Master, and is now Delphi) themselves make a product and (of course) is the only one they reccomend. Low sulphur, and bio diesel are hard on the governor retaining ring, so when you have your pump worked on make sure they install the new style cage retainer.