for my diesels we actually brew a mixture of ingredients to add to ulsd. i
mix the powerservice with cetane boost that comes in the white bottle with
marvel mystery oil in a 50/50 ratio. i then add 1ounce of this per gallon
at every fill up. this mixture was recommended to me by my fuel supplier,
who got the advice from their diesel supplier, who's chemical engineer
supposidly concocted this brew. of course this is all hearsay this far down
the ladder but i have never known marvel mystery oil to hurt anything at it
generally helps most things.
i just cringe every time i see someone filling up an older diesel truck that
was not engineered for the new fuel and then just driving off without adding
something to the fuel. my guess is that these trucks were designed with the
expectation of a certain amount of lubrication additives in the fuel. when
that got taken away i think that these vehicles are going to see some
durability issues. they say the new ones are designed for the new fuel but
i would still add some lubrication just to ease my mind if i was driving a
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