Hey guys, just wanted to get your opinions on something. First, the details on my car. It is a 1996 3.8 Camaro. I drive roughly 50-60 miles a day with it being 85-90% freeway miles so I use M1 so I can do a little longer drain intervals. I'm in the SF Bay Area and it doesn't get cold enough to snow, but the other night I went out to my car and it was all covered in frost. I'm using 10w-30 now but would going to 5w-30 even be beneficial since it doesn't get very cold or would it hurt during the summer months? BTW, I'm on 10w-30 Pennzoil now since I'm on a ARX rinse cycle.