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  • · Junior Member
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    Hi Idaho,
    Do you have any opinion about these products?
    Royal Diesel Supreme Ultra
    Royal X-140 Oil Improver
    Royal Diesel Guard
    Our local shop selles these. How do they compair to Delo400LE, Rev-X, & Opti-Lube XPD? I am thinking of changing my 2004 F250 6.0 to the latter. Just wondering if you think this is necessary or a good idea.
    Thanks, Jeff jt2@centex.net
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