For those of us who have been running B99 biodiesel thru the warmer months, now is the time to add some petroleum diesel to our fuel tanks to make sure there are no gelling problems.
Pure biodiesel will gel at colder temperatures; if you are having trouble starting your car in the morning, add some petroleum diesel to your fuel tank and let it mix in there. At the warmest part of the day, start up your car and then let it idle for a while.
SeQuential's recommendations are as follows:
45˚F, start blending with petroleum dieselBy the time temperatures reach 32F, you should be using 50% BIODIESEL and 50% diesel #2.
When temperatures get to 20F, you should be using 20% BIODIESEL and 80% diesel #2.