Definetly blend to prevent problems. But if you do gel up, no problems waiting until it warms up. It will liquify and be just fine, but it filters still tend to glod up. It's a lot harder for the fuel in the filter to completely liquify. So sometimes a filter change is still needed. Most biodiesel gels about 32°F. I've found that if day time temps are getting much above freezing then B100 will be fine, though starts on mornings around freezing will be tough. I've had several tanks gel up on me since 2005 when I start running biodiesel. I started blending to B50 in the fall, and B20 in the winter. This will varry depending on your local climate. When it starts getting near freezing at night I would blend to B50.

People always get stuck becuase they are running to high of a blend then a sudden cold snap come through. So hedging your bets by blending a little will save you a car that won't start.

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