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I talked to my local Detroit Diesel/Allison dealer (Penn Diesel). According to them, the oil companies are putting in additives to raise the lubricity of ULSD, but he said that since there arent any ULSD million mile engines yet to examine they are recommending additives for lubricity. They also told me cetane booter was a waste of my time. I am running an additive to make me feel better and for gelling (my buddy just got towed due to gelling at -5*F). There are LOTS of opinions on this. Good Luck!
 
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