Home generator oil type

norshorblufish said
I went to the frequently asked question section of their site here's a link.
Third paragraph down.

http://www.generac.com/Portables/Frequently_Asked_Questions/

I seen that recommendation on the Briggs site too. Concern I have is that I have lost power in both summer and winter. So my temp range is quite wide. I'm going with the 30 straight. Thanks