Syn Diff oil
NAPA in Sandpoint had Redline this summer. Try a hydraulics repair shop in that area too. There are a couple of shops just on the N side of 2 as you leave Sandpoint (near Dubs). You might check with the mechanics at the Marinas on yr side of the Lake. I haven't ever seen that stuff you are asking about...only familiar with Redline. Syn is syn, in my book. You ARE PAYing for Redlines name. Boat outdrives need good stuff tho.....