10W30 HM in the winter?

[Marius]

According to my 626's owner's manual, Mazda recommends using a 5w30 oil when the temperature is below 32F, and 10w30 when the temperature is above 0F. In my area, during the winter the temperature drops to single digits. I am currently using (and I am very pleased with) Mobil Drive Clean High Mileage (synthetic blend) 10w30, and I wonder if I should use the same grade during the winter months. I was thinking about using Mobil Drive Clean HM 5w30, but I have a hard time finding it. I would rather not use M1 (I don't want to risk starting a severe leak). My question is: will I be making a mistake by using MDC HM 10w30 during the winter?
I could use Citgo Supergard (I purchased a case of 5w30 Supergard for my other car) or Valvoline Maxlife 5w30 during the winter and MDC HM during the summer, but I don't want to switch back and forth between two different brands of oil.

 

[sjlee]

I actually run 5w30 all year round in my car with no problems at all.

If you garage your car during the winter, you're probably okay using 10w30, but otherwise, it may get too thick if it gets cold out, which is not a good thing.