Mobil 1 5w-50 in HD twin cam engine

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Go ahead and use it. It's a 50 grade at operating temp


NO!...it is a 5 weight oil period! With add-pack it has the characteristics of a 50 weight oil at operating temp...

I run 20w-50 in my two Harley's engines year round with no issues. And, it was 19 degrees the other day when I rode to work. Last summer for major road trip I put straight 60 weight in one with no issues..Lowest I would go would be 15w-50 in a Harley in those temps the OP is riding..just my two cents.
 
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