Warm Weather Conversion works in Cold Weather?

I am temporarily in Spokane. I recently came here after I purchased a '82 Mercedes Benz 240d in San Diego, Ca. It was converted for veggie oil down in SoCal about 2 years ago. I am not sure if the conversion is one that works in this colder climate. Any ideas/experience?
Also, any WVO for sale in Spokane?

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