I run Klotz KL-333 Synthetic in my 2.4 Birdgeport. I don't think you can go wrong with either Merc Synthetic or Klotz. You can contact Klotz out of Ft. Wayne, IN. I bought a case (4-Gallons) and with shipping, handling, tax, it came to about $140. Good Luck! http://free.***boat.net/ubb/cool.gif