we are leaving the 40's and are entering the 30's . I do use opti lube winter blend. what do you guys use.

read that 5% k1 is effective for anti gelling but not so for lube value.

 

Here in Minnesota I religiously fill at my local Cenex using their Roadmaster XL blend.
This Coop consists of the general public,business fleets, a school bus fleet and a large amount of area farmers that depend on a quality fuel. The fuel tech is able to make adjustments to the fuel for the upcoming cold weather. On the spot. The current blend is posted right on the pump on how much kerosene (#1 Diesel) is in the blend and how low of an ambient temp the fuel is good for.
One week I went there and the pump had a printed tag on it that read it was good to 10 below zero F. The following week we had a an arctic blast on its way and the tag read it was good to -20*F. The price is $.05 to $.15 more than #2 which is available right along side of the Roadmaster XL.
I don't really trust the competitor stations that have diesel pumps in their bays. I have asked, on a couple of occasions, if their winter blend "had showed up yet" in which their replies made my decision to buy elsewhere.
When my fuel of choice is not available, I like to add Stanadyne additive. I also have a bottle of Power Service Diesel 911 in my emergency kit. Although I have never had to use it, it may come in use should the situation arise.
*I receive cooperative dividends based on the amount of money I spend at my coop. Otherwise I am not affiliated with Roadmaster XL Fuel in any way.
MNBen

 

Northern Indiana here. I use the Power Service in the white bottle per the bottle's instructions. Double dose if temps are expected to get/stay below 0*F for a period of time. A few winters ago we had sustained tempt with daytime highs of -15*F. I didn't follow the directions that say use a double dose and got bit.

I also add ashless 2-cycle to every tank for lubricity reasons. Ratio of 1oz per gallon of fuel. Keep a bottle of 911 avialable just in case, but haven't needed it.