the ultra low sulfer fuel is just whats available.i am not doing it on purpose. i figured the sulfer was just sediment that the hardiness of the 617 consumed without complaint. my though was that maybe the sulfer could be part of what clogs injector and since i run ulsd my injectors were shiny. i'll post the videos of before and after engine noise.

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg