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oil for -30f winters
For *real* cold (-30 qualifies), you need a 10-30 or 5-30
Well actually, you would really benefit from a
synthetic - good flowability with good film strength
at higher temps - just what you ordered.
Now, you say you don;t want synthetic due to your 2.5k
change interval. Will you breach a contract if you
change your oil every 5k with synthetic? Why is
this figure so critical, if other factors outweigh it?