What part of Idaho? If your next change is before November go for it. Otherwise I'd do the 5w-30 and use the HD-30 first thing in say April.Got 5 quarts of HD-30 from a coworker. Any reason I couldn't run it in my Pathfinder for an OCI? I usually run 5w30 or 10w30 in it.
It's daily driven and it's been 105+ degrees outside lately so cold start temperature shouldn't be a problem.
Obviously I wouldn't consider doing this in the winter, but for the summer I'd be okay right?