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Message: <blockquote data-quote="lesgawlik" data-source="post: 62625" data-attributes="member: 4115"><p>I went through this about a year ago. After a lot of reading, I decided on Opti-Lube. They make a winter version which will help with gelling. The point is that most people are putting ULSD fuel in their machines. When the sulfur is removed, much of the lubricity of the fuel is removed. Older machines especially do not do well without the lubrication which diesel fuel used to contain. Additives put back some of that lubrication. I think that additives should be used all the time, and ones with anti-gelling properties should be run in the winter.</p></blockquote><p></p>