I have an MDS .40 P/L (ABC) with over ten gallons of fuel through it in a Fox engine, so they can at least fit a P/L to last. The MDS diesel I got has been used it appears, so it should have run at least a little. The description said nothing about P/L metallurgy or anything really, but I hope it’s ABC. Ferrous would be okay, but ABC would make more sense for a marine application.