Ben Jackson wrote:

Do you keep a multiweight oil in just for starts away from home?

I keep multi-grade in all year. I have a few friends who change grades with the
season, and there are always periods during Fall or Spring when they can't fly
because it's too warm or too cold and they either changed the oil too soon or
haven't changed it yet.

That said, my pre-heater is portable, and I carry it with me if I expect to need
it. I think it is no longer in production, though.

George Patterson
If you're not part of the solution, you can make a lot of money prolonging
the problem.