Re: B8HS-10 plug
The 8 is the heat range. Usually the 10 means that the case pack is 10 units.
I run the 7 here in Oklahoma. Seems to be about the best compromise --- though I do have a 6 that I use in the cooler weather.
(Remember that NGK is the only one that uses higher #'s for cooler plugs....)
You're never lost until you run outa gas.