Golden Fuels (then Greasel) sold me a kit with a brass recirc valve for diesel return used only for purging air. I've been off this forum for a while. Has evidence shown that recircing diesel hurt it's lubricy? I never had any trouble, but would like to hear the latest.

Mike Goodman
High Point, NC

Yes recircing D2 does hurt its lubricity if the D2 temp is raised above 120F. Adding >2% bio or VO to the D2 makes it have more than enough lubricity up to 200F.