On Tue, 20 Jul 2010 11:41:49 -0700 (PDT), Tim
wrote:

If my memory serves me correctly, Herring asked what kind of oil to
use to 'fog' his outboard for winterizing and WD-40 was mentioned. You
can buy fogging oil and use it only to find out that cheap WD, STP,
Liqui-Drench, and any other penetrating oil contains about the same
qualities as a $9.95 can of "genuine" fogging oil.

The whole idea of fogging is to leave a thin film of oil on the
pistons and cylinder walls to prevent corrosion. Even microscopic
amounts of corrosion will eventually lead to shorter life. That
said, WD-40 and penetrating oils are on the light side and evaporate
relatively quickly. I used to winterize my old sailboat engine, a
flat head gas engine, with Marvel Mystery oil. It always
started right up in the spring and lasted a long time.