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I agree with Thor, I bought a case of cetane booster from Ford and still trying to use it up. On my 05 F350 I didn't notice any improvement. Not to say none occurred, I just didn't notice any so why spend extra. Seems that most additives are usually additives to cost and not performance. I do like anti gel though especially if I travel out of the area and get to warm spots that don't have winterized diesel and return home to sub freezing temps.
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