Winter oil, Help me pick!

[SR5]

Run the RP 5W30. You want to, you have had it the longest, it's a good winter weight. Save the 40 for summer, even though it's 0w, and will work fine in winter anyway. Since you have enough for a full change, there is no need to mix, so don't.

 

[Branson304]

Any of these oils will do you just fine. I personally would use the Royal Purple. My second choice would be mix the Mobil 1 5w30 & 0W-40 together 50/50.