We run on Mercury Outboards!
OPST Lazar Running Line is an extremely slick mono running line that will help you launch monster casts. It is extremely durable, works well over a broad spectrum of temperatures, is hydrophobic and has a calculated amount of stretch built in to allow for easy knot tying. This stretch will produce great knot strength for you too. It does not have any memory at any temperature.
The OPST Pure Skagit Running Line also works great with Scandi fly lines.