ulsd has the same lubricity as lsd and hsd, thats the reason it is more expensive, lsd and hsd used the sulfer to lubricate everything, when going to the ulsd they have to refine the fuel more and add synthetic lubricants to the fuel to replace the sulfer. your truck is safe, it will not blow up because of ulsd, all you will see is a slight drop in fuel economy and horsepower. the ulsd doesnt burn as hot as lsd and hsd