No need to worry. The new oil is low ash to cut down on the loading of the DPF (Diesel Particulate Filter). You don't need to do ANYTHING different with the ultra low sulfur fuel or the low ash oil. This applies to 4 strokers. As usual, those of use with 2 strokers have to keep using straight 40 weight oil like Chevron Delo 100 (not Delo 400). 2 strokers are very receptive to most any kind of fuel. Good Luck, TomC